1
|
Yu Y, Feng T, Qiu H, Gu Y, Chen Q, Zuo C, Ma H. Simultaneous photoacoustic and ultrasound imaging: A review. ULTRASONICS 2024; 139:107277. [PMID: 38460216 DOI: 10.1016/j.ultras.2024.107277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 01/09/2024] [Accepted: 02/26/2024] [Indexed: 03/11/2024]
Abstract
Photoacoustic imaging (PAI) is an emerging biomedical imaging technique that combines the advantages of optical and ultrasound imaging, enabling the generation of images with both optical resolution and acoustic penetration depth. By leveraging similar signal acquisition and processing methods, the integration of photoacoustic and ultrasound imaging has introduced a novel hybrid imaging modality suitable for clinical applications. Photoacoustic-ultrasound imaging allows for non-invasive, high-resolution, and deep-penetrating imaging, providing a wealth of image information. In recent years, with the deepening research and the expanding biomedical application scenarios of photoacoustic-ultrasound bimodal systems, the immense potential of photoacoustic-ultrasound bimodal imaging in basic research and clinical applications has been demonstrated, with some research achievements already commercialized. In this review, we introduce the principles, technical advantages, and biomedical applications of photoacoustic-ultrasound bimodal imaging techniques, specifically focusing on tomographic, microscopic, and endoscopic imaging modalities. Furthermore, we discuss the future directions of photoacoustic-ultrasound bimodal imaging technology.
Collapse
Affiliation(s)
- Yinshi Yu
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China
| | - Ting Feng
- Academy for Engineering & Technology, Fudan University, Shanghai 200433,China.
| | - Haixia Qiu
- First Medical Center of PLA General Hospital, Beijing, China
| | - Ying Gu
- First Medical Center of PLA General Hospital, Beijing, China
| | - Qian Chen
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China
| | - Chao Zuo
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China.
| | - Haigang Ma
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China.
| |
Collapse
|
2
|
Lin L, Chen L, Yan J, Chen P, Du J, Zhu J, Yang X, Geng B, Li L, Zeng W. Advances of nanoparticle-mediated diagnostic and theranostic strategies for atherosclerosis. Front Bioeng Biotechnol 2023; 11:1268428. [PMID: 38026849 PMCID: PMC10666776 DOI: 10.3389/fbioe.2023.1268428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 10/16/2023] [Indexed: 12/01/2023] Open
Abstract
Atherosclerotic plaque remains the primary cause of morbidity and mortality worldwide. Accurate assessment of the degree of atherosclerotic plaque is critical for predicting the risk of atherosclerotic plaque and monitoring the results after intervention. Compared with traditional technology, the imaging technologies of nanoparticles have distinct advantages and great development prospects in the identification and characterization of vulnerable atherosclerotic plaque. Here, we systematically summarize the latest advances of targeted nanoparticle approaches in the diagnosis of atherosclerotic plaque, including multimodal imaging, fluorescence imaging, photoacoustic imaging, exosome diagnosis, and highlighted the theranostic progress as a new therapeutic strategy. Finally, we discuss the major challenges that need to be addressed for future development and clinical transformation.
Collapse
Affiliation(s)
- Lin Lin
- School of Medicine, Chongqing University, Chongqing, China
- Department of Cell Biology, Third Military Medical University, Chongqing, China
- Jinfeng Laboratory, Chongqing, China
| | - Lin Chen
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Juan Yan
- Department of Cell Biology, Third Military Medical University, Chongqing, China
- Jinfeng Laboratory, Chongqing, China
| | - Peirong Chen
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Jiahui Du
- Department of Cell Biology, Third Military Medical University, Chongqing, China
- Jinfeng Laboratory, Chongqing, China
| | - Junpeng Zhu
- Department of Cell Biology, Third Military Medical University, Chongqing, China
- Jinfeng Laboratory, Chongqing, China
| | - Xinyu Yang
- Department of Cell Biology, Third Military Medical University, Chongqing, China
- Jinfeng Laboratory, Chongqing, China
| | - Boxin Geng
- Department of Cell Biology, Third Military Medical University, Chongqing, China
- Jinfeng Laboratory, Chongqing, China
| | - Lang Li
- Department of Cell Biology, Third Military Medical University, Chongqing, China
- Jinfeng Laboratory, Chongqing, China
| | - Wen Zeng
- School of Medicine, Chongqing University, Chongqing, China
- Department of Cell Biology, Third Military Medical University, Chongqing, China
- Jinfeng Laboratory, Chongqing, China
| |
Collapse
|
3
|
Barulin A, Park H, Park B, Kim I. Dual-wavelength UV-visible metalens for multispectral photoacoustic microscopy: A simulation study. PHOTOACOUSTICS 2023; 32:100545. [PMID: 37645253 PMCID: PMC10461252 DOI: 10.1016/j.pacs.2023.100545] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 08/01/2023] [Accepted: 08/13/2023] [Indexed: 08/31/2023]
Abstract
Photoacoustic microscopy is advancing with research on utilizing ultraviolet and visible light. Dual-wavelength approaches are sought for observing DNA/RNA- and vascular-related disorders. However, the availability of high numerical aperture lenses covering both ultraviolet and visible wavelengths is severely limited due to challenges such as chromatic aberration in the optics. Herein, we present a groundbreaking proposal as a pioneering simulation study for incorporating multilayer metalenses into ultraviolet-visible photoacoustic microscopy. The proposed metalens has a thickness of 1.4 µm and high numerical aperture of 0.8. By arranging cylindrical hafnium oxide nanopillars, we design an achromatic transmissive lens for 266 and 532 nm wavelengths. The metalens achieves a diffraction-limited focal spot, surpassing commercially available objective lenses. Through three-dimensional photoacoustic simulation, we demonstrate high-resolution imaging with superior endogenous contrast of targets with ultraviolet and visible optical absorption bands. This metalens will open new possibilities for downsized multispectral photoacoustic microscopy in clinical and preclinical applications.
Collapse
Affiliation(s)
- Aleksandr Barulin
- Department of Biophysics, Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hyemi Park
- Department of Intelligent Precision Healthcare Convergence, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Byullee Park
- Department of Biophysics, Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Inki Kim
- Department of Biophysics, Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Intelligent Precision Healthcare Convergence, Sungkyunkwan University, Suwon 16419, Republic of Korea
| |
Collapse
|
4
|
Choi H, Shin SH. Secured computed tomography scanner using a random bit. Technol Health Care 2023; 31:55-59. [PMID: 37038781 DOI: 10.3233/thc-236006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
BACKGROUND Patient data in current computed tomography scanner machines are transferred through several communication channels, such as WiFi, to the mobile channel platform. Therefore, patient information is an important security concern. Medical imaging must be protected using various methods. OBJECTIVE The current hardware-dependent method for generating random bits exhibits predictable or inconvenient physical characteristics. Therefore, a more flexible random-bit generation technique is to be devised. METHODS We propose a deterministic random bit generation algorithm that uses a mathematical periodic function. RESULTS After randomizing the image using the proposed random bit, the performance is analyzed and compared with that of the processed image. CONCLUSION The random bit generation method using a mathematical algorithm shows higher entropy than the random bit generated by hardware.
Collapse
Affiliation(s)
- Hojong Choi
- Department of Electronic Engineering, Gachon University, Seongnam, Korea
| | - Seung-Hyeok Shin
- Department of Mathematics and Big-data Science, Kumoh National Institute of Technology, Gumi, Korea
| |
Collapse
|
5
|
Remala A, Reddy KK, Velagapudi P. Advances in Intravascular Ultrasound. INDIAN JOURNAL OF CARDIOVASCULAR DISEASE IN WOMEN 2023. [DOI: 10.25259/ijcdw_2_2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
Since its inception, intravascular ultrasound (IVUS) and optical coherence tomography (OCT) have played a significant role in evaluating the pathophysiology of coronary artery disease (CAD) guiding the interventional and medical management of CAD improving outcomes in patients. Although the benefits of each of these modalities have been proven, due to some limitations, no single intravascular imaging technique has been proven to provide a detailed and complete evaluation of all CAD lesions. The use of different intravascular imaging modalities sequentially may lead to complications, which are cumbersome, consume time, and add financial burden to the patient. Recently, hybrid imaging catheters that combine OCT and IVUS benefits have been developed to limit these problems. Intravascular imaging techniques we are using currently have some drawbacks that hinder accurate assessment of plaque morphology and pathobiology as demonstrated in many histological studies, causing difficulty in identifying high-risk plaques. To overcome these limitations, great efforts have been put into developing hybrid, dual-probe catheters by combining imaging modalities to get an accurate analysis of plaque characteristics, and high-risk lesions. At present, many dual-probe catheters are available including combined IVUS-OCT, near-infrared spectroscopy-IVUS that is available commercially, the OCT-near infrared fluorescence (NIRF) molecular imaging, IVUS-NIRF, and combined fluorescence lifetime-IVUS imaging. Application of this combined multimodal imaging in clinical practice overcomes the limitations of standalone imaging and helps in providing a comprehensive and accurate visualization of plaque characteristics, composition, and plaque biology. The present article summarizes the advances in hybrid intravascular imaging, analyses the technical hindrances that should be known to have a use in the different clinical circumstances, and the till date shreds of evidence available from their first clinical application aiming to bring these modalities into the limelight and their potential role in the study of CAD.
Collapse
|
6
|
Liang Y, Fu W, Li Q, Chen X, Sun H, Wang L, Jin L, Huang W, Guan BO. Optical-resolution functional gastrointestinal photoacoustic endoscopy based on optical heterodyne detection of ultrasound. Nat Commun 2022; 13:7604. [PMID: 36494360 PMCID: PMC9734171 DOI: 10.1038/s41467-022-35259-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 11/24/2022] [Indexed: 12/13/2022] Open
Abstract
Photoacoustic endoscopy shows promise in the detection of gastrointestinal cancer, inflammation, and other lesions. High-resolution endoscopic imaging of the hemodynamic response necessitates a small-sized, high-sensitivity ultrasound sensor. Here, we utilize a laser ultrasound sensor to develop a miniaturized, optical-resolution photoacoustic endoscope. The sensor can boost the acoustic response by a gain factor of ωo/Ω (the frequency ratio of the signal light and measured ultrasound) by measuring the acoustically induced optical phase change. As a result, we achieve a noise-equivalent pressure density (NEPD) below 1.5 mPa·Hz-1/2 over the measured range of 5 to 25 MHz. The heterodyne phase detection using dual-frequency laser beams of the sensor can offer resistance to thermal drift and vibrational perturbations. The endoscope is used to in vivo image a rat rectum and visualize the oxygen saturation changes during acute inflammation, which can hardly be observed with other imaging modalities.
Collapse
Affiliation(s)
- Yizhi Liang
- grid.258164.c0000 0004 1790 3548Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, China
| | - Wubing Fu
- grid.258164.c0000 0004 1790 3548Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, China
| | - Qiang Li
- grid.258164.c0000 0004 1790 3548Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, China
| | - Xiaolong Chen
- grid.258164.c0000 0004 1790 3548Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, China
| | - Huojiao Sun
- grid.258164.c0000 0004 1790 3548Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, China
| | - Lidai Wang
- grid.35030.350000 0004 1792 6846Department of Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR China
| | - Long Jin
- grid.258164.c0000 0004 1790 3548Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, China
| | - Wei Huang
- grid.258164.c0000 0004 1790 3548Department of Gastroenterology, the First Affiliated Hospital, Jinan University, Guangzhou, Guangdong China
| | - Bai-Ou Guan
- grid.258164.c0000 0004 1790 3548Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, China
| |
Collapse
|
7
|
Fu L, Khazaeinezhad R, Hariri A, Qi B, Chen C, Jokerst JV. Posterior photoacoustic/ultrasound imaging of the periodontal pocket with a compact intraoral transducer. PHOTOACOUSTICS 2022; 28:100408. [PMID: 36204181 PMCID: PMC9530592 DOI: 10.1016/j.pacs.2022.100408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 08/15/2022] [Accepted: 09/25/2022] [Indexed: 06/16/2023]
Abstract
Periodontitis is a public issue and imaging periodontal pocket is important to evaluate periodontitis. Regular linear transducers have limitations in imaging the posterior teeth due to their geometry restrictions. Here we characterized a transducer that can image the posterior teeth including assessment of periodontal pockets via a combination of photoacoustic and ultrasound imaging. Unlike conventional transducer design, this device has a toothbrush-shaped form factor with a side-view transducer to image molars (total size: 1 ×1.9 cm). A laser diode was integrated as the light source to reduce the cost and size and facilitates clinical transition. The in vivo imaging of a molar of a periodontal patient demonstrated that the transducer could image in the posterior area of gum in vivo; the value determined by imaging was within 7 % of the value measured clinically.
Collapse
Affiliation(s)
- Lei Fu
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
| | | | - Ali Hariri
- StyloSonic LLC, Lake Forest, CA 92630, USA
| | - Baiyan Qi
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA 92093, USA
| | - Casey Chen
- Herman Ostrow School of Dentistry, University of Southern California, 925 West 34th Street, Los Angeles, CA 90089, USA
| | - Jesse V. Jokerst
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
- StyloSonic LLC, Lake Forest, CA 92630, USA
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA 92093, USA
- Department of Radiology, University of California San Diego, La Jolla, CA 92093, USA
| |
Collapse
|
8
|
Ren D, Li C, Shi J, Chen R. A Review of High-Frequency Ultrasonic Transducers for Photoacoustic Imaging Applications. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:1848-1858. [PMID: 34941509 DOI: 10.1109/tuffc.2021.3138158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Photoacoustic imaging (PAI) is a new and rapidly growing hybrid biomedical imaging modality that combines the virtues of both optical and ultrasonic (US) imaging. The nature of the interaction between light and ultrasound waves allows PAI to make good use of the rich contrast produced by optics while retaining the imaging depths in US imaging. High-frequency US transducers are an important part of the PAI systems, used to detect the high-frequency and broad-bandwidth photoacoustic signals excited by the target tissues irradiated by short laser pulses. Advancement in high-frequency US transducer technology has influenced the boost of PAI to broad applications. Here, we present a review on high-frequency US transducer technologies for PAI applications, including advanced piezoelectric materials and representative transducers. In addition, we discuss the new challenges and directions facing the development of high-frequency US transducers for PAI applications.
Collapse
|
9
|
Fu L, Jin Z, Qi B, Yim W, Wu Z, He T, Jokerst JV. Synchronization of RF Data in Ultrasound Open Platforms (UOPs) for High-Accuracy and High-Resolution Photoacoustic Tomography Using the "Scissors" Programming Method. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:1994-2000. [PMID: 35377843 PMCID: PMC9149135 DOI: 10.1109/tuffc.2022.3164371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Synchronization is important for photoacoustic (PA) tomography, but some fixed delays between the data acquisition (DAQ) and the light pulse are a common problem degrading imaging quality. Here, we present a simple yet versatile method named "Scissors" to help synchronize ultrasound open platforms (UOPs) for PA imaging. Scissors is a programed function that can cut or add a fixed delay to radio frequency (RF) data and, thus, synchronize it before reconstruction. Scissors applies the programmable metric of UOPs and has several advantages. It is compatible with many setups regardless of the synchronization methods, light sources, transducers, and delays. The synchronization is adjustable in steps reciprocal to the UOPs' sampling rate (20-ns step with a 50-MHz sampling rate). Scissors works in real-time PA imaging, and no extra hardware is needed. We programed Scissors in Vantage UOP (Verasonics, Inc., Kirkland, WA, USA) and then imaged two 30- [Formula: see text] nichrome wires with a 20.2-MHz central frequency transducer. The PA image was severely distorted by an 828-ns delay; over 90% delay was caused by our Q -switch laser. The axial and lateral resolutions are 112 and [Formula: see text], respectively, after using Scissors. We imaged a human finger in vivo, and the imaging quality is tremendously improved after solving the 828-ns delay by using Scissors.
Collapse
|
10
|
Fu L, Ling C, Jin Z, Luo J, Palma-Chavez J, Wu Z, Zhou J, Zhou J, Donovan B, Qi B, Mishra A, He T, Jokerst JV. Photoacoustic imaging of posterior periodontal pocket using a commercial hockey-stick transducer. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:JBO-210363GR. [PMID: 35610752 PMCID: PMC9128833 DOI: 10.1117/1.jbo.27.5.056005] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 05/02/2022] [Indexed: 06/02/2023]
Abstract
SIGNIFICANCE Photoacoustic imaging has shown advantages over the periodontal probing method in measuring the periodontal probing depth, but the large size of conventional photoacoustic transducers prevents imaging of the more posterior teeth. AIM Our aim is to develop a photoacoustic imaging system to image the more posterior periodontal pocket. APPROACH We report a clinical "hockey-stick"-style transducer integrated with fibers for periodontal photoacoustic imaging. Cuttlefish ink labeled the periodontal pocket as the photoacoustic contrast agent. RESULTS We characterized the imaging system and then measured the pocket depth of 35 swine teeth. Three raters evaluated the performance of the hockey-stick transducer. The measurements between the Williams probing (gold standard) and the photoacoustic methods were blinded but highly correlated. We showed a bias of ∼0.3 mm for the imaging-based technique versus Williams probing. The minimum inter-reliability was over 0.60 for three different raters of varying experience, suggesting that this approach to measure the periodontal pocket is reproducible. Finally, we imaged three pre-molars of a human subject. We could access more upper and posterior teeth than conventional linear transducers. CONCLUSIONS The unique angle shape of the hockey-stick transducer allows it to image more posterior teeth than regular linear transducers. This study demonstrated the ability of a hockey-stick transducer to measure the periodontal pocket via photoacoustic imaging.
Collapse
Affiliation(s)
- Lei Fu
- University of California San Diego, Department of NanoEngineering, La Jolla, California, United States
| | - Chen Ling
- University of California San Diego, Department of NanoEngineering, La Jolla, California, United States
| | - Zhicheng Jin
- University of California San Diego, Department of NanoEngineering, La Jolla, California, United States
| | - Jessica Luo
- University of California San Diego, Department of NanoEngineering, La Jolla, California, United States
| | - Jorge Palma-Chavez
- University of California San Diego, Department of NanoEngineering, La Jolla, California, United States
| | - Zhuohong Wu
- University of California San Diego, Department of NanoEngineering, La Jolla, California, United States
| | - Jingcheng Zhou
- University of California San Diego, Department of NanoEngineering, La Jolla, California, United States
| | - Jiajing Zhou
- University of California San Diego, Department of NanoEngineering, La Jolla, California, United States
| | - Brian Donovan
- University of California San Diego, Department of NanoEngineering, La Jolla, California, United States
| | - Baiyan Qi
- University of California San Diego, Materials Science and Engineering Program, La Jolla, California, United States
| | - Aditya Mishra
- University of California San Diego, Materials Science and Engineering Program, La Jolla, California, United States
| | - Tengyu He
- University of California San Diego, Materials Science and Engineering Program, La Jolla, California, United States
| | - Jesse V. Jokerst
- University of California San Diego, Department of NanoEngineering, La Jolla, California, United States
- University of California San Diego, Materials Science and Engineering Program, La Jolla, California, United States
- University of California San Diego, Department of Radiology, La Jolla, California, United States
| |
Collapse
|
11
|
Abstract
Photoacoustic (PA) imaging is able to provide extremely high molecular
contrast while maintaining the superior imaging depth of ultrasound (US)
imaging. Conventional microscopic PA imaging has limited access to deeper tissue
due to strong light scattering and attenuation. Endoscopic PA technology enables
direct delivery of excitation light into the interior of a hollow organ or
cavity of the body for functional and molecular PA imaging of target tissue.
Various endoscopic PA probes have been developed for different applications,
including the intravascular imaging of lipids in atherosclerotic plaque and
endoscopic imaging of colon cancer. In this paper, the authors review
representative probe configurations and corresponding preclinical applications.
In addition, the potential challenges and future directions of endoscopic PA
imaging are discussed.
Collapse
Affiliation(s)
- Yan Li
- Beckman Laser Institute, University of California Irvine,
Irvine, CA 92617, USA
| | - Gengxi Lu
- Roski Eye Institute, Keck School of Medicine, University of
Southern California, Los Angeles, CA 90033, USA
| | - Qifa Zhou
- Roski Eye Institute, Keck School of Medicine, University of
Southern California, Los Angeles, CA 90033, USA
| | - Zhongping Chen
- Beckman Laser Institute, University of California Irvine,
Irvine, CA 92617, USA
- The Edwards Lifesciences Center for Cardiovascular
Technology, University of California Irvine, Irvine, CA 92617, USA
- Department of Biomedical Engineering, University of
California Irvine, Irvine, CA 92697, USA
- Correspondence:
| |
Collapse
|
12
|
Peng C, Wu H, Kim S, Dai X, Jiang X. Recent Advances in Transducers for Intravascular Ultrasound (IVUS) Imaging. SENSORS (BASEL, SWITZERLAND) 2021; 21:3540. [PMID: 34069613 PMCID: PMC8160965 DOI: 10.3390/s21103540] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 05/11/2021] [Accepted: 05/17/2021] [Indexed: 12/16/2022]
Abstract
As a well-known medical imaging methodology, intravascular ultrasound (IVUS) imaging plays a critical role in diagnosis, treatment guidance and post-treatment assessment of coronary artery diseases. By cannulating a miniature ultrasound transducer mounted catheter into an artery, the vessel lumen opening, vessel wall morphology and other associated blood and vessel properties can be precisely assessed in IVUS imaging. Ultrasound transducer, as the key component of an IVUS system, is critical in determining the IVUS imaging performance. In recent years, a wide range of achievements in ultrasound transducers have been reported for IVUS imaging applications. Herein, a comprehensive review is given on recent advances in ultrasound transducers for IVUS imaging. Firstly, a fundamental understanding of IVUS imaging principle, evaluation parameters and IVUS catheter are summarized. Secondly, three different types of ultrasound transducers (piezoelectric ultrasound transducer, piezoelectric micromachined ultrasound transducer and capacitive micromachined ultrasound transducer) for IVUS imaging are presented. Particularly, the recent advances in piezoelectric ultrasound transducer for IVUS imaging are extensively examined according to their different working mechanisms, configurations and materials adopted. Thirdly, IVUS-based multimodality intravascular imaging of atherosclerotic plaque is discussed. Finally, summary and perspectives on the future studies are highlighted for IVUS imaging applications.
Collapse
Affiliation(s)
- Chang Peng
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, USA; (C.P.); (H.W.)
| | - Huaiyu Wu
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, USA; (C.P.); (H.W.)
| | | | - Xuming Dai
- Department of Cardiology, New York-Presbyterian Queens Hospital, Flushing, NY 11355, USA;
| | - Xiaoning Jiang
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, USA; (C.P.); (H.W.)
| |
Collapse
|
13
|
Novel Bandwidth Expander Supported Power Amplifier for Wideband Ultrasound Transducer Devices. SENSORS 2021; 21:s21072356. [PMID: 33800641 PMCID: PMC8037455 DOI: 10.3390/s21072356] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 03/24/2021] [Accepted: 03/25/2021] [Indexed: 01/08/2023]
Abstract
Ultrasound transducer devices have their own frequency ranges, depending on the applications and specifications, due to penetration depth, sensitivity, and image resolution. For imaging applications, in particular, the transducer devices are preferable to have a wide bandwidth due to the specific information generated by the tissue or blood vessel structures. To support these ultrasound transducer devices, ultrasound power amplifier hardware with a wide bandwidth can improve the transducer performance. Therefore, we developed a new bandwidth expander circuit using specially designed switching architectures to increase the power amplifier bandwidth. The measured bandwidth of the power amplifier with the help of the bandwidth expander circuit increased by 56.9%. In addition, the measured echo bandwidths of the 15-, 20-, and 25-MHz transducer devices were increased by 8.1%, 6.0%, and 9.8%, respectively, with the help of the designed bandwidth expander circuit. Therefore, the designed architecture could help an ultrasound system hardware with a wider bandwidth, thus supporting the use of different frequency ultrasound transducer devices with a single developed ultrasound system.
Collapse
|
14
|
Ali Z, Zakian C, Ntziachristos V. Ultra-broadband axicon transducer for optoacoustic endoscopy. Sci Rep 2021; 11:1654. [PMID: 33462279 PMCID: PMC7814136 DOI: 10.1038/s41598-021-81117-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 12/29/2020] [Indexed: 01/12/2023] Open
Abstract
Image performance in optoacoustic endoscopy depends markedly on the design of the transducer employed. Ideally, high-resolution performance is required over an expanded depth of focus. Current optoacoustic focused transducers achieve lateral resolutions in the range of tens of microns in the mesoscopic regime, but their depth of focus is limited to hundreds of microns by the nature of their spherical geometry. We designed an ultra-broadband axicon detector with a 2 mm central aperture and investigated whether the imaging characteristics exceeded those of a spherical detector of similar size. We show a previously undocumented ability to achieve a broadband elongated pencil-beam optoacoustic sensitivity with an axicon detection geometry, providing approximately 40 μm-lateral resolution maintained over a depth of focus of 950 μm—3.8 times that of the reference spherical detector. This performance could potentially lead to optoacoustic endoscopes that can visualize optical absorption deeper and with higher resolution than any other optical endoscope today.
Collapse
Affiliation(s)
- Zakiullah Ali
- Chair of Biological Imaging, Central Institute for Translational Cancer Research (TranslaTUM), Technical University of Munich, Munich, Germany.,Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
| | - Christian Zakian
- Chair of Biological Imaging, Central Institute for Translational Cancer Research (TranslaTUM), Technical University of Munich, Munich, Germany.,Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
| | - Vasilis Ntziachristos
- Chair of Biological Imaging, Central Institute for Translational Cancer Research (TranslaTUM), Technical University of Munich, Munich, Germany. .,Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany.
| |
Collapse
|
15
|
Sung JH, Jeong EY, Jeong JS. Intravascular Ultrasound Transducer by Using Polarization Inversion Technique for Tissue Harmonic Imaging: Modeling and Experiments. IEEE Trans Biomed Eng 2020; 67:3380-3391. [PMID: 32286955 DOI: 10.1109/tbme.2020.2986284] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Intravascular ultrasound (IVUS) tissue harmonic imaging (THI) is a useful vessel imaging technique that can provide deep penetration depth as well as high spatial and contrast resolution. Typically, a high-frequency IVUS transducer for THI requires a broad bandwidth or dual-frequency bandwidth. However, it is very difficult to make an IVUS transducer with a frequency bandwidth covering from the fundamental frequency to the second harmonic or a dual-peak at the desired frequency. To solve this problem, in this study, we applied the polarization inversion technique (PIT) to the IVUS transducer for THI. The PIT makes it relatively easy to design IVUS transducers with suitable frequency characteristics for THI depending on the inversion ratio of the piezoelectric layer and specifications of the passive materials. In this study, two types of IVUS transducers based on the PIT were developed for THI. One is a front-side inversion layer (FSIL) transducer with a broad bandwidth, and the other is a back-side inversion layer (BSIL) transducer with a dual-frequency bandwidth. These transducers were designed using finite element analysis (FEA)-based simulation, and the prototype transducers were fabricated. Subsequently, the performance was evaluated by not only electrical impedance and pulse-echo response tests but also B-mode imaging tests with a 25 μm tungsten wire and tissue-mimicking gelatin phantoms. The FEA simulation and experimental results show that the proposed scheme can successfully implement the tissue harmonic IVUS image, and thus it can be one of the promising techniques for developing IVUS transducers for THI.
Collapse
|
16
|
Wang H, Ma Y, Yang H, Jiang H, Ding Y, Xie H. MEMS Ultrasound Transducers for Endoscopic Photoacoustic Imaging Applications. MICROMACHINES 2020; 11:E928. [PMID: 33053796 PMCID: PMC7601211 DOI: 10.3390/mi11100928] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 10/03/2020] [Accepted: 10/04/2020] [Indexed: 12/14/2022]
Abstract
Photoacoustic imaging (PAI) is drawing extensive attention and gaining rapid development as an emerging biomedical imaging technology because of its high spatial resolution, large imaging depth, and rich optical contrast. PAI has great potential applications in endoscopy, but the progress of endoscopic PAI was hindered by the challenges of manufacturing and assembling miniature imaging components. Over the last decade, microelectromechanical systems (MEMS) technology has greatly facilitated the development of photoacoustic endoscopes and extended the realm of applicability of the PAI. As the key component of photoacoustic endoscopes, micromachined ultrasound transducers (MUTs), including piezoelectric MUTs (pMUTs) and capacitive MUTs (cMUTs), have been developed and explored for endoscopic PAI applications. In this article, the recent progress of pMUTs (thickness extension mode and flexural vibration mode) and cMUTs are reviewed and discussed with their applications in endoscopic PAI. Current PAI endoscopes based on pMUTs and cMUTs are also introduced and compared. Finally, the remaining challenges and future directions of MEMS ultrasound transducers for endoscopic PAI applications are given.
Collapse
Affiliation(s)
- Haoran Wang
- Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA;
| | - Yifei Ma
- School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China; (Y.M.); (Y.D.)
| | - Hao Yang
- Department of Medical Engineering, University of South Florida, Tampa, FL 33620, USA; (H.Y.); (H.J.)
| | - Huabei Jiang
- Department of Medical Engineering, University of South Florida, Tampa, FL 33620, USA; (H.Y.); (H.J.)
| | - Yingtao Ding
- School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China; (Y.M.); (Y.D.)
| | - Huikai Xie
- School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China; (Y.M.); (Y.D.)
| |
Collapse
|
17
|
Wen X, Lei P, Xiong K, Zhang P, Yang S. High-robustness intravascular photoacoustic endoscope with a hermetically sealed opto-sono capsule. OPTICS EXPRESS 2020; 28:19255-19269. [PMID: 32672206 DOI: 10.1364/oe.394781] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The prevailing open-structure intravascular photoacoustic (IVPA) endoscope emits a gradually deformed laser beam with exposed optical or acoustical components bearing pollution and damage in arterial lumen. Deformed laser beam scanning, which causes a low excitation efficiency and serious deterioration of the transverse resolution, is a current big obstacle to the application of photoacoustic endoscopy in intravascular imaging. Hence, the stable and reliable IVPA endoscope is indispensable. In this letter, we designed a high-robustness intravascular photoacoustic (HR-IVPA) endoscope with a hermetically sealed opto-sono capsule. The distal end of the opto-sono capsule was integrated with miniaturized optics, including a customized C-Lens and a customized total-reflection prism (TRP). The TRP was first applied to a side-viewing IVPA endoscope, featuring a high-throughput energy coupling efficiency of 90% and a cut-off free damage threshold. The optical path structure of the endoscope, optimized using optical simulation tools, overcame the ambiguous focus shift caused by chromatic dispersion and achieved a waist size of 20 µm as well as a focus depth of 4 mm in water at the wavelength of 1200 nm. The mass phantom experiments demonstrated that the HR-IVPA endoscope afforded repeatable IVPA images with a relatively constant signal-to-noise ratio (SNR) of about ∼41.8 dB and a transverse resolution of about ∼23 µm. The imaging experiments of the stent and lipid further demonstrated the robustness and validated the imaging ability of the HR-IVPA endoscope, which opens a new avenue for improving the endoscopic imaging capability, strengthening the credible detection of atherosclerotic cardiovascular disease.
Collapse
|
18
|
Current Advances in the Diagnostic Imaging of Atherosclerosis: Insights into the Pathophysiology of Vulnerable Plaque. Int J Mol Sci 2020; 21:ijms21082992. [PMID: 32340284 PMCID: PMC7216001 DOI: 10.3390/ijms21082992] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 04/02/2020] [Accepted: 04/15/2020] [Indexed: 12/13/2022] Open
Abstract
Atherosclerosis is a lipoprotein-driven inflammatory disorder leading to a plaque formation at specific sites of the arterial tree. After decades of slow progression, atherosclerotic plaque rupture and formation of thrombi are the major factors responsible for the development of acute coronary syndromes (ACSs). In this regard, the detection of high-risk (vulnerable) plaques is an ultimate goal in the management of atherosclerosis and cardiovascular diseases (CVDs). Vulnerable plaques have specific morphological features that make their detection possible, hence allowing for identification of high-risk patients and the tailoring of therapy. Plaque ruptures predominantly occur amongst lesions characterized as thin-cap fibroatheromas (TCFA). Plaques without a rupture, such as plaque erosions, are also thrombi-forming lesions on the most frequent pathological intimal thickening or fibroatheromas. Many attempts to comprehensively identify vulnerable plaque constituents with different invasive and non-invasive imaging technologies have been made. In this review, advantages and limitations of invasive and non-invasive imaging modalities currently available for the identification of plaque components and morphologic features associated with plaque vulnerability, as well as their clinical diagnostic and prognostic value, were discussed.
Collapse
|
19
|
Improved Depth-of-Field Photoacoustic Microscopy with a Multifocal Point Transducer for Biomedical Imaging. SENSORS 2020; 20:s20072020. [PMID: 32260296 PMCID: PMC7181221 DOI: 10.3390/s20072020] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 03/21/2020] [Accepted: 04/02/2020] [Indexed: 12/24/2022]
Abstract
In this study, a photoacoustic microscopy (PAM) system based on a multifocal point (MFP) transducer was fabricated to produce a large depth-of-field tissue image. The customized MFP transducer has seven focal points, distributed along with the transducer’s axis, fabricated by separate spherically-focused surfaces. These surfaces generate distinct focal zones that are overlapped to extend the depth-of-field. This design allows extending the focal zone of 10 mm for the 11 MHz MFP transducer, which is a great improvement over the 0.48 mm focal zone of the 11 MHz single focal point (SFP) transducer. The PAM image penetration depths of a chicken-hemoglobin phantom using SFP and MFP transducers were measured as 5 mm and 8 mm, respectively. The significant increase in the PAM image-based penetration depth of the chicken-hemoglobin phantom was a result of using the customized MFP transducer.
Collapse
|
20
|
Zhao T, Desjardins AE, Ourselin S, Vercauteren T, Xia W. Minimally invasive photoacoustic imaging: Current status and future perspectives. PHOTOACOUSTICS 2019; 16:100146. [PMID: 31871889 PMCID: PMC6909166 DOI: 10.1016/j.pacs.2019.100146] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 07/26/2019] [Accepted: 09/30/2019] [Indexed: 05/09/2023]
Abstract
Photoacoustic imaging (PAI) is an emerging biomedical imaging modality that is based on optical absorption contrast, capable of revealing distinct spectroscopic signatures of tissue at high spatial resolution and large imaging depths. However, clinical applications of conventional non-invasive PAI systems have been restricted to examinations of tissues at depths less than a few cm due to strong light attenuation. Minimally invasive photoacoustic imaging (miPAI) has greatly extended the landscape of PAI by delivering excitation light within tissue through miniature fibre-optic probes. In the past decade, various miPAI systems have been developed with demonstrated applicability in several clinical fields. In this article, we present an overview of the current status of miPAI and our thoughts on future perspectives.
Collapse
Affiliation(s)
- Tianrui Zhao
- School of Biomedical Engineering and Imaging Sciences, King’s College London, 4th Floor, Lambeth Wing St Thomas’ Hospital London, London SE1 7EH, United Kingdom
| | - Adrien E. Desjardins
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, United Kingdom
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, Charles Bell House, 67-73 Riding House Street, London W1W 7EJ, United Kingdom
| | - Sebastien Ourselin
- School of Biomedical Engineering and Imaging Sciences, King’s College London, 4th Floor, Lambeth Wing St Thomas’ Hospital London, London SE1 7EH, United Kingdom
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Tom Vercauteren
- School of Biomedical Engineering and Imaging Sciences, King’s College London, 4th Floor, Lambeth Wing St Thomas’ Hospital London, London SE1 7EH, United Kingdom
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Wenfeng Xia
- School of Biomedical Engineering and Imaging Sciences, King’s College London, 4th Floor, Lambeth Wing St Thomas’ Hospital London, London SE1 7EH, United Kingdom
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, United Kingdom
| |
Collapse
|
21
|
Iskander-Rizk S, van der Steen AFW, van Soest G. Photoacoustic imaging for guidance of interventions in cardiovascular medicine. Phys Med Biol 2019; 64:16TR01. [PMID: 31048573 DOI: 10.1088/1361-6560/ab1ede] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Imaging guidance is paramount to procedural success in minimally invasive interventions. Catheter-based therapies are the standard of care in the treatment of many cardiac disorders, including coronary artery disease, structural heart disease and electrophysiological conditions. Many of these diseases are caused by, or effect, a change in vasculature or cardiac tissue composition, which can potentially be detected by photoacoustic imaging. This review summarizes the state of the art in photoacoustic imaging approaches that have been proposed for intervention guidance in cardiovascular care. All of these techniques are currently in the preclinical phase. We will conclude with an outlook towards clinical applications.
Collapse
Affiliation(s)
- Sophinese Iskander-Rizk
- Department of Cardiology, Biomedical Engineering, Erasmus MC University Medical Center Rotterdam, Wytemaweg 80, 3015 CN Rotterdam, The Netherlands
| | | | | |
Collapse
|
22
|
Arkan EF, Degertekin FL. Analysis and Design of High-Frequency 1-D CMUT Imaging Arrays in Noncollapsed Mode. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2019; 66:382-393. [PMID: 30571620 PMCID: PMC6415772 DOI: 10.1109/tuffc.2018.2887043] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
High-frequency ultrasound imaging arrays are important for a broad range of applications, from small animal imaging to photoacoustics. Capacitive micromachined ultrasonic transducer (CMUT) arrays are particularly attractive for these applications as low noise receiver electronics can be integrated for an overall improved performance. In this paper, we present a comprehensive analysis of high-frequency CMUT arrays based on an experimentally verified CMUT array simulation tool. The results obtained on an example, a 40-MHz 1-D CMUT array for intravascular imaging, are used to obtain key design insights and tradeoffs for receive only and pulse-echo imaging. For the receiver side, thermal mechanical current noise, plane wave pressure sensitivity, and pressure noise spectrum are extracted from simulations. Using these parameters, we find that the receiver performance of CMUT arrays can be close to an ideal piston, independent of gap thickness, and applied dc bias, when coupled to low noise electronics with arrays utilizing smaller membranes performing better. For pulse-echo imaging, thermal mechanical current noise limited signal-to-noise ratio is observed to be dependent on the maximum available voltage and gap thickness. In terms of bandwidth, we find that the Bragg resonance of the array, related to the fill factor, is a significant determinant of the high frequency limit and the fluid loaded single membrane resonance determines the lower limit. Based on these results, we present design guidelines requiring only fluid loaded single membrane simulations and membrane pitch to achieve a desired pulse-echo response. We also provide a design example and discuss limitations of the approach.
Collapse
|
23
|
Choi H, Choe SW. Acoustic Stimulation by Shunt-Diode Pre-Linearizer using Very High Frequency Piezoelectric Transducer for Cancer Therapeutics. SENSORS 2019; 19:s19020357. [PMID: 30654599 PMCID: PMC6359139 DOI: 10.3390/s19020357] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 01/04/2019] [Accepted: 01/14/2019] [Indexed: 02/06/2023]
Abstract
In this paper, we proposed cancer cell acoustic stimulation by shunt-diode pre-linearizer scheme using a very high frequency (≥100 MHz) piezoelectric transducer. To verify the concept of our proposed scheme, we performed pulse-echo detection, and accessed therapeutic effects of human cervical cancer cells exposed to acoustic stimulation experiments using 100 MHz focused piezoelectric transducer triggered by PA with and without the proposed shunt-diode pre-linearizer scheme. In the pulse-echo detection responses, the peak-to-peak voltage of the echo signal when using the PA with shunt-diode pre-linearizer (49.79 mV) was higher than that when using the PA alone (29.87 mV). In the experimental results, the cell densities of cancer cells on Day 4 when using no acoustic stimulation (control group), the very high-frequency piezoelectric transducer triggered by PA only and PA combined with proposed pre-linearizer schemes (1 V and 5 V DC bias voltages) showed 100%, 92.8 ± 4.2%, 84.2 ± 4.6%, and 78 ± 2.9%, respectively. Therefore, we confirmed that the shunt-diode pre-linearizer could improve the performances of the pulse signals of the PA, thus, enabling better therapeutic stimulation performances for cancer cell suppression.
Collapse
Affiliation(s)
- Hojong Choi
- Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea
| | - Se-Woon Choe
- Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea.
| |
Collapse
|
24
|
Wu X, Sanders JL, Zhang X, Yamaner FY, Oralkan O. An FPGA-Based Backend System for Intravascular Photoacoustic and Ultrasound Imaging. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2019; 66:45-56. [PMID: 30442605 PMCID: PMC6384193 DOI: 10.1109/tuffc.2018.2881409] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The integration of intravascular ultrasound (IVUS) and intravascular photoacoustic (IVPA) imaging produces an imaging modality with high sensitivity and specificity which is particularly needed in interventional cardiology. Conventional side-looking IVUS imaging with a single-element ultrasound (US) transducer lacks forward-viewing capability, which limits the application of this imaging mode in intravascular intervention guidance, Doppler-based flow measurement, and visualization of nearly, or totally blocked arteries. For both side-looking and forward-looking imaging, the necessity to mechanically scan the US transducer limits the imaging frame rate, and therefore, array-based solutions are desired. In this paper, we present a low-cost, compact, high-speed, and programmable imaging system based on a field-programmable gate array suitable for dual-mode forward-looking IVUS/IVPA imaging. The system has 16 US transmit and receive channels and functions in multiple modes including interleaved photoacoustic (PA) and US imaging, hardware-based high-frame-rate US imaging, software-driven US imaging, and velocity measurement. The system is implemented in the register-transfer level, and the central system controller is implemented as a finite-state machine. The system was tested with a capacitive micromachined ultrasonic transducer array. A 170-frames-per-second (FPS) US imaging frame rate is achieved in the hardware-based high-frame-rate US imaging mode while the interleaved PA and US imaging mode operates at a 60-FPS US and a laser-limited 20-FPS PA imaging frame rate. The performance of the system benefits from the flexibility and efficiency provided by the low-level implementation. The resulting system provides a convenient backend platform for research and clinical IVPA and IVUS imaging.
Collapse
|
25
|
Choi H, Ju YJ, Jo JH, Ryu JM. Chromatic aberration free reflective mirror-based optical system design for multispectral photoacoustic instruments. Technol Health Care 2019; 27:397-406. [PMID: 31045556 PMCID: PMC6598014 DOI: 10.3233/thc-199036] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
BACKGROUND Current multispectral photoacoustic instruments must use large and separate combinational structures to obtain various biological tissue information for multispectral ranges. OBJECTIVE The optical aberration generated from the multispectral photoacoustic systems may reduce the image quality of biological tissue because the improper structures for combining light of different wavelength cannot produce good optical ray convergence points. To prevent this, complex combined structures need to be considered at the design level for multispectral photoacoustic systems. METHODS In place of an optical refracted lens system, reflective mirrors could be designed for optical systems. To verify our proposed idea, we assessed optical distortion performance using red, green, and blue light, and combined optical light sources to compare their chromatic aberration characteristics. RESULTS The high optical performance is realized regardless of the wavelength for a light source combined with multiple wavelengths, because our optical system was designed with only a reflective surface. CONCLUSIONS The designed optical system using a reflective mirror can provide multispectral optical sources (such as infrared, visible, and ultraviolet optical lights) with only one light ray path, without any chromatic aberrations.
Collapse
Affiliation(s)
- Hojong Choi
- Department of Medical Convergence Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea
| | - Yun Jae Ju
- Department of Photonics and Sensors, Hannam University, Daejon 34430, Korea
| | - Jae Heung Jo
- Department of Photonics and Sensors, Hannam University, Daejon 34430, Korea
| | - Jae-Myung Ryu
- Department of Optical Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea
| |
Collapse
|
26
|
Development of a Multiwavelength Visible-Range-Supported Opto⁻Ultrasound Instrument Using a Light-Emitting Diode and Ultrasound Transducer. SENSORS 2018; 18:s18103324. [PMID: 30282961 PMCID: PMC6210455 DOI: 10.3390/s18103324] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 09/30/2018] [Accepted: 09/30/2018] [Indexed: 11/16/2022]
Abstract
A new multiwavelength visible-range-supported opto–ultrasound instrument using a light-emitting diode and ultrasound transducer was developed in order to produce multiwavelength visible light with minimized color aberration errors, and detect ultrasound signals emitted from the target. In the instrument, the developed optical systems can provide multiwavelength optical transmission with low optical aberration within 10-cm ranges that are reasonably flat in the modulation transfer function at spatial frequencies of 20 and 40 lp/mm, except at the end of the diagonal edge of the samples. To assess the instrument capability, we performed pulse–echo responses with Thunnus obesus eye samples. Focused red, green, blue and white light rays from an integrated red, green and blue LED source were produced, and echo signal amplitudes of 33.53, 34.92, 38.74 and 82.54 mV, respectively, were detected from the Thunnus obesus eye samples by a 10-MHz focused ultrasound transducer. The center frequencies of the echo signal when producing red, green, blue and white LED light in the instrument were 9.02, 9.05, 9.21 and 8.81 MHz, respectively. From these tests, we verify that this instrument can combine red, green and blue LED light to cover different wavelengths in the visible-light range and detect reasonable echo amplitudes from the samples.
Collapse
|
27
|
Zhang T, Ou-Yang J, Yang X, Zhu B. Transferred PMN-PT Thick Film on Conductive Silver Epoxy. MATERIALS 2018; 11:ma11091621. [PMID: 30189636 PMCID: PMC6165122 DOI: 10.3390/ma11091621] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 08/25/2018] [Accepted: 09/03/2018] [Indexed: 11/23/2022]
Abstract
Approximately 25 μm Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN-PT) thick film was synthesized based on a sol-gel/composite route. The obtained PMN-PT thick film was successfully transferred from the Silicon substrate to the conductive silver epoxy using a novel wet chemical method. The mechanism of this damage free transfer was explored and analyzed. Compared with the film on Silicon substrate, the transferred one exhibited superior dielectric, ferroelectric and piezoelectric properties. These promising results indicate that transferred PMN-PT thick film possesses the capability for piezoelectric device application, especially for ultrasound transducer fabrication. Most importantly, this chemical route opens a new path for transfer of thick film.
Collapse
Affiliation(s)
- Tao Zhang
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Jun Ou-Yang
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Xiaofei Yang
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Benpeng Zhu
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
- State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Shanghai 200050, China.
| |
Collapse
|
28
|
Liang S, Lashkari B, Choi SSS, Ntziachristos V, Mandelis A. The application of frequency-domain photoacoustics to temperature-dependent measurements of the Grüneisen parameter in lipids. PHOTOACOUSTICS 2018; 11:56-64. [PMID: 30112278 PMCID: PMC6091231 DOI: 10.1016/j.pacs.2018.07.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 07/15/2018] [Accepted: 07/26/2018] [Indexed: 05/21/2023]
Abstract
The Grüneisen parameter is an essential factor in biomedical photoacoustic (PA) diagnostics. In most PA imaging applications, the variation of the Grüneisen parameter with tissue type is insignificant. This is not the case for PA imaging and characterization of lipids, as they have a very distinct Grüneisen parameter compared with other tissue types. One example of PA applications involving lipids is the imaging and characterization of atherosclerotic plaques. Intravascular photoacoustic (IVPA) imaging is a promising diagnostic tool that can evaluate both plaque severity and composition. The literature for IVPA has mainly focused on using the difference in absorption coefficients between plaque components and healthy arterial tissues. However, the Grüneisen parameters for lipids and their behavior with temperature have not been well established in the literature. In this study we employ frequency-domain photoacoustic measurements to estimate the Grüneisen parameter by virtue of the ability of this modality to independently measure both the absorption coefficient and the Grüneisen parameter through the use of the phase channel. The values of the Grüneisen parameters of some lipids are calculated as functions of temperature in the range 25-45 °C.
Collapse
Affiliation(s)
- Simon Liang
- Center for Advanced Diffusion-Wave and Photoacoustic Technologies (CADIPT), Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, M5S 3G8, Canada
- Department of Medicine, University of British Columbia, Canada
| | - Bahman Lashkari
- Center for Advanced Diffusion-Wave and Photoacoustic Technologies (CADIPT), Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, M5S 3G8, Canada
| | - Sung Soo Sean Choi
- Center for Advanced Diffusion-Wave and Photoacoustic Technologies (CADIPT), Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, M5S 3G8, Canada
| | - Vasilis Ntziachristos
- Institute for Biological and Medical Imaging, Technische Universität München and Helmholtz Zentrum München, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Andreas Mandelis
- Center for Advanced Diffusion-Wave and Photoacoustic Technologies (CADIPT), Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, M5S 3G8, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, M5S 3G9, Canada
- Institute for Biological and Medical Imaging, Technische Universität München and Helmholtz Zentrum München, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| |
Collapse
|
29
|
Optical Ultrasound Generation and Detection for Intravascular Imaging: A Review. JOURNAL OF HEALTHCARE ENGINEERING 2018; 2018:3182483. [PMID: 29854358 PMCID: PMC5952521 DOI: 10.1155/2018/3182483] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 03/09/2018] [Accepted: 03/15/2018] [Indexed: 12/30/2022]
Abstract
Combined ultrasound and photoacoustic imaging has attracted significant interests for intravascular imaging such as atheromatous plaque detection, with ultrasound imaging providing spatial location and morphology and photoacoustic imaging highlighting molecular composition of the plaque. Conventional ultrasound imaging systems utilize piezoelectric ultrasound transducers, which suffer from limited frequency bandwidths and reduced sensitivity with miniature transducer elements. Recent advances on optical methods for both ultrasound generation and detection have shown great promise, as they provide efficient and ultrabroadband ultrasound generation and sensitive and ultrabroadband ultrasound detection. As such, all-optical ultrasound imaging has a great potential to become a next generation ultrasound imaging method. In this paper, we review recent developments on optical ultrasound transmitters, detectors, and all-optical ultrasound imaging systems, with a particular focus on fiber-based probes for intravascular imaging. We further discuss our thoughts on future directions on developing combined all-optical photoacoustic and ultrasound imaging systems for intravascular imaging.
Collapse
|
30
|
Abstract
The rupture of atherosclerotic plaques is the leading cause of death in developed countries. Early identification of vulnerable plaque is the essential step in preventing acute coronary events. Intravascular photoacoustic (IVPA) technology is able to visualize chemical composition of atherosclerotic plaque with high specificity and sensitivity. Integrated with intravascular ultrasound (IVUS) imaging, this multimodal intravascular IVPA/IVUS imaging technology is able to provide both structural and chemical compositions of arterial walls for detecting and characterizing atherosclerotic plaques. In this paper, we present representative multimodal IVPA/IVUS imaging systems and discuss current scientific innovations, potential limitations, and prospective improvements for characterization of coronary atherosclerosis.
Collapse
Affiliation(s)
- Yan Li
- Beckman Laser Institute, University of California, Irvine, 1002 Health Sciences Road, Irvine, CA 92617 USA
| | - Zhongping Chen
- Beckman Laser Institute, University of California, Irvine, 1002 Health Sciences Road, Irvine, CA 92617 USA.,Department of Biomedical Engineering, University of California, Irvine, Irvine, CA 92697-2700 USA
| |
Collapse
|
31
|
Fei C, Yang Y, Guo F, Lin P, Chen Q, Zhou Q, Sun L. PMN-PT Single Crystal Ultrasonic Transducer With Half-Concave Geometric Design for IVUS Imaging. IEEE Trans Biomed Eng 2017; 65:2087-2092. [PMID: 29989942 DOI: 10.1109/tbme.2017.2784437] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
As the key component of intravascular ultrasound (IVUS) imaging systems, traditional commercial side-looking IVUS transducers are flat and unfocused, which limits their lateral resolution. We propose a PMN-PT single crystal IVUS transducer with a half-concave geometry. This unique configuration makes it possible to conduct geometric focusing at a desired depth. To compare performances, the proposed and the traditional flat transducer with similar dimensions were fabricated. We determined that the half-concave transducer has a slightly higher center frequency (35 MHz), significantly broader -6 dB bandwidth (54%) but a higher insertion loss (-22.4 dB) compared to the flat transducer (32 MHz, 28%, and -19.3 dB, respectively). A significant enhancement of the lateral resolution was also confirmed. The experimental results are in agreement with the finite element simulation results. This preliminary investigation suggests that the half-concave geometry design is a promising approach in the development of focused IVUS transducers with broad bandwidth and high lateral resolution.
Collapse
|
32
|
Vogt WC, Jia C, Wear KA, Garra BS, Pfefer TJ. Phantom-based image quality test methods for photoacoustic imaging systems. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:1-14. [PMID: 28901055 DOI: 10.1117/1.jbo.22.9.095002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 08/15/2017] [Indexed: 05/07/2023]
Abstract
As photoacoustic imaging (PAI) technologies advance and applications arise, there is increasing need for standardized approaches to provide objective, quantitative performance assessment at various stages of the product development and clinical translation process. We have developed a set of performance test methods for PAI systems based on breast-mimicking tissue phantoms containing embedded inclusions. Performance standards for mature imaging modalities [magnetic resonance imaging (MRI), computed tomography (CT), and ultrasound] were used to guide selection of critical PAI image quality characteristics and experimental methods. Specifically, the tests were designed to address axial, lateral, and elevational spatial resolution, signal uniformity, penetration depth, sensitivity, spatial measurement accuracy, and PAI-ultrasound coregistration. As an initial demonstration of the utility of these test methods, we characterized the performance of a modular, bimodal PAI-ultrasound system using four clinical ultrasound transducers with varying design specifications. Results helped to inform optimization of acquisition and data processing procedures while providing quantitative elucidation of transducer-dependent differences in image quality. Comparison of solid, tissue-mimicking polymer phantoms with those based on Intralipid indicated the superiority of the former approach in simulating real-world conditions for PAI. This work provides a critical foundation for the establishment of well-validated test methods that will facilitate the maturation of PAI as a medical imaging technology.
Collapse
Affiliation(s)
- William C Vogt
- U.S. Food and Drug Administration, Center for Devices and Radiological Health, 10903 New Hampshire A, United States
| | - Congxian Jia
- U.S. Food and Drug Administration, Center for Devices and Radiological Health, 10903 New Hampshire A, United States
| | - Keith A Wear
- U.S. Food and Drug Administration, Center for Devices and Radiological Health, 10903 New Hampshire A, United States
| | - Brian S Garra
- U.S. Food and Drug Administration, Center for Devices and Radiological Health, 10903 New Hampshire A, United States
| | - T Joshua Pfefer
- U.S. Food and Drug Administration, Center for Devices and Radiological Health, 10903 New Hampshire A, United States
| |
Collapse
|
33
|
Choi H, Woo PC, Yeom JY, Yoon C. Power MOSFET Linearizer of a High-Voltage Power Amplifier for High-Frequency Pulse-Echo Instrumentation. SENSORS 2017; 17:s17040764. [PMID: 28375165 PMCID: PMC5421724 DOI: 10.3390/s17040764] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 03/28/2017] [Accepted: 03/31/2017] [Indexed: 12/03/2022]
Abstract
A power MOSFET linearizer is proposed for a high-voltage power amplifier (HVPA) used in high-frequency pulse-echo instrumentation. The power MOSFET linearizer is composed of a DC bias-controlled series power MOSFET shunt with parallel inductors and capacitors. The proposed scheme is designed to improve the gain deviation characteristics of the HVPA at higher input powers. By controlling the MOSFET bias voltage in the linearizer, the gain reduction into the HVPA was compensated, thereby reducing the echo harmonic distortion components generated by the ultrasonic transducers. In order to verify the performance improvement of the HVPA implementing the power MOSFET linearizer, we measured and found that the gain deviation of the power MOSFET linearizer integrated with HVPA under 10 V DC bias voltage was reduced (−1.8 and −0.96 dB, respectively) compared to that of the HVPA without the power MOSFET linearizer (−2.95 and −3.0 dB, respectively) when 70 and 80 MHz, three-cycle, and 26 dBm input pulse waveforms are applied, respectively. The input 1-dB compression point (an index of linearity) of the HVPA with power MOSFET linearizer (24.17 and 26.19 dBm at 70 and 80 MHz, respectively) at 10 V DC bias voltage was increased compared to that of HVPA without the power MOSFET linearizer (22.03 and 22.13 dBm at 70 and 80 MHz, respectively). To further verify the reduction of the echo harmonic distortion components generated by the ultrasonic transducers, the pulse-echo responses in the pulse-echo instrumentation were compared when using HVPA with and without the power MOSFET linearizer. When three-cycle 26 dBm input power was applied, the second, third, fourth, and fifth harmonic distortion components of a 75 MHz transducer driven by the HVPA with power MOSFET linearizer (−48.34, −44.21, −48.34, and −46.56 dB, respectively) were lower than that of the HVPA without the power MOSFET linearizer (−45.61, −41.57, −45.01, and −45.51 dB, respectively). When five-cycle 20 dBm input power was applied, the second, third, fourth, and fifth harmonic distortions of the HVPA with the power MOSFET linearizer (−41.54, −41.80, −48.86, and −46.27 dB, respectively) were also lower than that of the HVPA without the power MOSFET linearizer (−25.85, −43.56, −49.04, and −49.24 dB, respectively). Therefore, we conclude that the power MOSFET linearizer could reduce gain deviation of the HVPA, thus reducing the echo signal harmonic distortions generated by the high-frequency ultrasonic transducers in pulse-echo instrumentation.
Collapse
Affiliation(s)
- Hojong Choi
- Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea.
| | - Park Chul Woo
- Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea.
| | - Jung-Yeol Yeom
- School of Biomedical Engineering, Korea University, Seoul 02841, Korea.
| | - Changhan Yoon
- Department of Biomedical Engineering, Inje University, Gimhae 50834, Korea.
| |
Collapse
|
34
|
Furdella KJ, Witte RS, Vande Geest JP. Tracking delivery of a drug surrogate in the porcine heart using photoacoustic imaging and spectroscopy. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:41016. [PMID: 28192566 DOI: 10.1117/1.jbo.22.4.041016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 01/20/2017] [Indexed: 06/06/2023]
Abstract
Although the drug-eluting stent (DES) has dramatically reduced the rate of coronary restenosis, it still occurs in up to 20% of patients with a DES. Monitoring drug delivery could be one way to decrease restenosis rates. We demonstrate real-time photoacoustic imaging and spectroscopy (PAIS) using a wavelength-tunable visible laser and clinical ultrasound scanner to track cardiac drug delivery. The photoacoustic signal was initially calibrated using porcine myocardial samples soaked with a known concentration of a drug surrogate (DiI). Next, an in situ coronary artery was perfused with DiI for 20 min and imaged to monitor dye transport in the tissue. Finally, a partially DiI-coated stent was inserted into the porcine brachiocephalic trunk for imaging. The photoacoustic signal was proportional to the DiI concentration between 2.4 and 120 ?? ? g / ml , and the dye was detected over 1.5 mm from the targeted coronary vessel. Photoacoustic imaging was also able to differentiate the DiI-coated portion of the stent from the uncoated region. These results suggest that PAIS can track drug delivery to cardiac tissue and detect drugs loaded onto a stent with sub-mm precision. Future work using PAIS may help improve DES design and reduce the probability of restenosis.
Collapse
Affiliation(s)
- Kenneth J Furdella
- University of Pittsburgh, Department of Bioengineering, Pittsburgh, Pennsylvania, United States
| | - Russell S Witte
- University of Arizona, Department of Medical Imaging, Tucson, Arizona, United States
| | - Jonathan P Vande Geest
- University of Pittsburgh, Department of Bioengineering, Pittsburgh, Pennsylvania, United States
| |
Collapse
|
35
|
Choi H, Ryu JM, Yeom JY. Development of a Double-Gauss Lens Based Setup for Optoacoustic Applications. SENSORS 2017; 17:s17030496. [PMID: 28273794 PMCID: PMC5375782 DOI: 10.3390/s17030496] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2016] [Revised: 01/23/2017] [Accepted: 02/10/2017] [Indexed: 12/28/2022]
Abstract
In optoacoustic (photoacoustic) systems, different echo signal intensities such as amplitudes, center frequencies, and bandwidths need to be compensated by utilizing variable gain or time-gain compensation amplifiers. However, such electronic components can increase system complexities and signal noise levels. In this paper, we introduce a double-Gauss lens to generate a large field of view with uniform light intensity due to the low chromatic aberrations of the lens, thus obtaining uniform echo signal intensities across the field of view of the optoacoustic system. In order to validate the uniformity of the echo signal intensities in the system, an in-house transducer was placed at various positions above a tissue sample and echo signals were measured and compared with each other. The custom designed double-Gauss lens demonstrated negligible light intensity variation (±1.5%) across the illumination field of view (~2 cm diameter). When the transducer was used to measure echo signal from an eye of a bigeye tuna within a range of ±1 cm, the peak-to-peak amplitude, center frequency, and their −6 dB bandwidth variations were less than 2 mV, 1 MHz, and 6%, respectively. The custom designed double-Gauss lens can provide uniform light beam across a wide area while generating insignificant echo signal variations, and thus can lower the burden of the receiving electronics or signal processing in the optoacoustic system.
Collapse
Affiliation(s)
- Hojong Choi
- Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea.
| | - Jae-Myung Ryu
- Department of Optical System Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea.
| | - Jung-Yeol Yeom
- School of Biomedical Engineering, Korea University, Seoul 02841, Korea.
| |
Collapse
|
36
|
Bourantas CV, Jaffer FA, Gijsen FJ, van Soest G, Madden SP, Courtney BK, Fard AM, Tenekecioglu E, Zeng Y, van der Steen AF, Emelianov S, Muller J, Stone PH, Marcu L, Tearney GJ, Serruys PW. Hybrid intravascular imaging: recent advances, technical considerations, and current applications in the study of plaque pathophysiology. Eur Heart J 2017; 38:400-412. [PMID: 27118197 PMCID: PMC5837589 DOI: 10.1093/eurheartj/ehw097] [Citation(s) in RCA: 129] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2015] [Revised: 01/31/2016] [Accepted: 02/22/2016] [Indexed: 11/14/2022] Open
Abstract
Cumulative evidence from histology-based studies demonstrate that the currently available intravascular imaging techniques have fundamental limitations that do not allow complete and detailed evaluation of plaque morphology and pathobiology, limiting the ability to accurately identify high-risk plaques. To overcome these drawbacks, new efforts are developing for data fusion methodologies and the design of hybrid, dual-probe catheters to enable accurate assessment of plaque characteristics, and reliable identification of high-risk lesions. Today several dual-probe catheters have been introduced including combined near infrared spectroscopy-intravascular ultrasound (NIRS-IVUS), that is already commercially available, IVUS-optical coherence tomography (OCT), the OCT-NIRS, the OCT-near infrared fluorescence (NIRF) molecular imaging, IVUS-NIRF, IVUS intravascular photoacoustic imaging and combined fluorescence lifetime-IVUS imaging. These multimodal approaches appear able to overcome limitations of standalone imaging and provide comprehensive visualization of plaque composition and plaque biology. The aim of this review article is to summarize the advances in hybrid intravascular imaging, discuss the technical challenges that should be addressed in order to have a use in the clinical arena, and present the evidence from their first applications aiming to highlight their potential value in the study of atherosclerosis.
Collapse
Affiliation(s)
| | - Farouc A. Jaffer
- Cardiovascular Research Center and Cardiology Division, Harvard Medical School and Massachusetts General Hospital, Boston, MA, USA
| | - Frank J. Gijsen
- Thorax Center, Erasmus MC, ‘s-Gravendijkwal 230, 3015 CE Rotterdam, The Netherlands
| | - Gijs van Soest
- Thorax Center, Erasmus MC, ‘s-Gravendijkwal 230, 3015 CE Rotterdam, The Netherlands
| | | | - Brian K. Courtney
- Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Canada
| | - Ali M. Fard
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, Boston, MA, USA
| | - Erhan Tenekecioglu
- Thorax Center, Erasmus MC, ‘s-Gravendijkwal 230, 3015 CE Rotterdam, The Netherlands
| | - Yaping Zeng
- Thorax Center, Erasmus MC, ‘s-Gravendijkwal 230, 3015 CE Rotterdam, The Netherlands
| | | | - Stanislav Emelianov
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, USA
| | | | - Peter H. Stone
- Cardiovascular Division, Brigham & Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Laura Marcu
- Department of Biomedical Engineering, University of California, CA, USA
| | - Guillermo J. Tearney
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, Boston, MA, USA
| | - Patrick W. Serruys
- Thorax Center, Erasmus MC, ‘s-Gravendijkwal 230, 3015 CE Rotterdam, The Netherlands
- International Centre for Cardiovascular Health, NHLI, Imperial College London, London, UK
| |
Collapse
|
37
|
A Novel Fisheye-Lens-Based Photoacoustic System. SENSORS 2016; 16:s16122185. [PMID: 27999376 PMCID: PMC5191164 DOI: 10.3390/s16122185] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 12/08/2016] [Accepted: 12/14/2016] [Indexed: 12/16/2022]
Abstract
This paper presents a novel fisheye-lens-based photoacoustic (PA) system. In conventional PA systems, mechanical motors are utilized to obtain the target information due to the small fields of view of such systems. The use of such motors introduces mechanical noise, which is difficult to remove when processing the echo signals. A fisheye lens system offering a wide field of view would effectively reduce the motor effects (i.e., the noise) and enable the system to have a wide field of view. Therefore, in this work, we propose a novel fisheye lens scheme and describe a PA system based on the developed lens scheme. In addition, to confirm the feasibility of the fisheye-lens-based PA system, we present the typical pulse-echo responses obtained using a 20 MHz single element immersion transducer and the echo signals measured from bull’s eye tissue samples separated by approximately 4, 6, 8, and 10 cm diagonally and 2 cm vertically from the fisheye lens. The experimental results demonstrate that the echo signal amplitudes, their center frequencies, and the −6 dB bandwidths obtained using red, green, and blue lights and a fisheye lens are acceptable when the fisheye lens is separated from a sample both diagonally and vertically. Therefore, fisheye-lens-based PA systems could be a potential method of achieving wide fields of view while reducing the mechanical motor effects.
Collapse
|
38
|
Daeichin V, Wu M, De Jong N, van der Steen AFW, van Soest G. Frequency Analysis of the Photoacoustic Signal Generated by Coronary Atherosclerotic Plaque. ULTRASOUND IN MEDICINE & BIOLOGY 2016; 42:2017-25. [PMID: 27181689 DOI: 10.1016/j.ultrasmedbio.2016.03.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 03/10/2016] [Accepted: 03/20/2016] [Indexed: 05/11/2023]
Abstract
The identification of unstable atherosclerotic plaques in the coronary arteries is emerging as an important tool for guiding percutaneous coronary interventions and may enable preventive treatment of such plaques in the future. Assessment of plaque stability requires imaging of both structure and composition. Spectroscopic photoacoustic (sPA) imaging can visualize atherosclerotic plaque composition on the basis of the optical absorption contrast. It is an established fact that the frequency content of the photoacoustic (PA) signal is correlated with structural tissue properties. As PA signals can be weak, it is important to match the transducer bandwidth to the signal frequency content for in vivo imaging. In this ex vivo study on human coronary arteries, we combined sPA imaging and analysis of frequency content of the PA signals. Using a broadband transducer (-3-dB one-way bandwidth of 10-35 MHz) and a 1-mm needle hydrophone (calibrated for 1-20 MHz), we covered a large frequency range of 1-35 MHz for receiving the PA signals. Spectroscopic PA imaging was performed at wavelengths ranging from 1125 to 1275 nm with a step of 2 nm, allowing discrimination between plaque lipids and adventitial tissue. Under sPA imaging guidance, the frequency content of the PA signals from the plaque lipids was quantified. Our data indicate that more than 80% of the PA energy of the coronary plaque lipids lies in the frequency band below 8 MHz. This frequency information can guide the choice of the transducer element used for PA catheter fabrication.
Collapse
Affiliation(s)
- Verya Daeichin
- Thoraxcenter Biomedical Engineering, Erasmus MC, Rotterdam, The Netherlands.
| | - Min Wu
- Thoraxcenter Biomedical Engineering, Erasmus MC, Rotterdam, The Netherlands
| | - Nico De Jong
- Thoraxcenter Biomedical Engineering, Erasmus MC, Rotterdam, The Netherlands; Acoustic Wavefield Imaging, Delft University of Technology, Delft, The Netherlands
| | - Antonius F W van der Steen
- Thoraxcenter Biomedical Engineering, Erasmus MC, Rotterdam, The Netherlands; Acoustic Wavefield Imaging, Delft University of Technology, Delft, The Netherlands
| | - Gijs van Soest
- Thoraxcenter Biomedical Engineering, Erasmus MC, Rotterdam, The Netherlands
| |
Collapse
|
39
|
High-sensitivity intravascular photoacoustic imaging of lipid-laden plaque with a collinear catheter design. Sci Rep 2016; 6:25236. [PMID: 27121894 PMCID: PMC4848524 DOI: 10.1038/srep25236] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 04/13/2016] [Indexed: 11/26/2022] Open
Abstract
A highly sensitive catheter probe is critical to catheter-based intravascular photoacoustic imaging. Here, we present a photoacoustic catheter probe design on the basis of collinear alignment of the incident optical wave and the photoacoustically generated sound wave within a miniature catheter housing for the first time. Such collinear catheter design with an outer diameter of 1.6 mm provided highly efficient overlap between optical and acoustic waves over an imaging depth of >6 mm in D2O medium. Intravascular photoacoustic imaging of lipid-laden atherosclerotic plaque and perivascular fat was demonstrated, where a lab-built 500 Hz optical parametric oscillator outputting nanosecond optical pulses at a wavelength of 1.7 μm was used for overtone excitation of C-H bonds. In addition to intravascular imaging, the presented catheter design will benefit other photoacoustic applications such as needle-based intramuscular imaging.
Collapse
|
40
|
Hui J, Li R, Phillips EH, Goergen CJ, Sturek M, Cheng JX. Bond-selective photoacoustic imaging by converting molecular vibration into acoustic waves. PHOTOACOUSTICS 2016; 4:11-21. [PMID: 27069873 PMCID: PMC4811918 DOI: 10.1016/j.pacs.2016.01.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 01/11/2016] [Indexed: 05/04/2023]
Abstract
The quantized vibration of chemical bonds provides a way of detecting specific molecules in a complex tissue environment. Unlike pure optical methods, for which imaging depth is limited to a few hundred micrometers by significant optical scattering, photoacoustic detection of vibrational absorption breaks through the optical diffusion limit by taking advantage of diffused photons and weak acoustic scattering. Key features of this method include both high scalability of imaging depth from a few millimeters to a few centimeters and chemical bond selectivity as a novel contrast mechanism for photoacoustic imaging. Its biomedical applications spans detection of white matter loss and regeneration, assessment of breast tumor margins, and diagnosis of vulnerable atherosclerotic plaques. This review provides an overview of the recent advances made in vibration-based photoacoustic imaging and various biomedical applications enabled by this new technology.
Collapse
Affiliation(s)
- Jie Hui
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
| | - Rui Li
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Evan H. Phillips
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Craig J. Goergen
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Michael Sturek
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Ji-Xin Cheng
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
- Purdue Institute of Inflammation, Immunology and Infectious Diseases, West Lafayette, IN 47907, USA
| |
Collapse
|
41
|
Li J, Chen Z. Integrated intravascular ultrasound and optical coherence tomography technology: a promising tool to identify vulnerable plaques [INVITED PAPER]. JOURNAL OF BIOMEDICAL PHOTONICS & ENGINEERING 2016; 1. [PMID: 28966987 DOI: 10.18287/jbpe-2015-1-4-209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
Heart attack is mainly caused by the rupture of a vulnerable plaque. IVUS-OCT is a novel medical imaging modality that provides opportunities for accurate assessment of vulnerable plaques in vivo in patients. IVUS provides deep penetration to image the whole necrotic core while OCT enables accurate measurement of the fibrous cap of a plaque owing to its high resolution. In this paper, the authors describe the fundamentals, the technical designs and the applications of IVUS-OCT technology. Results from cadaver specimens are summarized, which indicated the complementary nature of OCT and IVUS for assessment of vulnerable plaques, plaque composition, and stent-tissue interactions. Furthermore, previously reported in vivo animal experiments are reviewed to assess the clinical adaptability of IVUS-OCT. Future directions for this technology are also discussed in this review.
Collapse
Affiliation(s)
- Jiawen Li
- Beckman Laser Institute, University of California, Irvine, 1002 Health Sciences Road East, Irvine, CA 92612, USA
| | - Zhongping Chen
- Beckman Laser Institute, University of California, Irvine, 1002 Health Sciences Road East, Irvine, CA 92612, USA
| |
Collapse
|
42
|
Wu M, Fw van der Steen A, Regar E, van Soest G. Emerging Technology Update Intravascular Photoacoustic Imaging of Vulnerable Atherosclerotic Plaque. Interv Cardiol 2016; 11:120-123. [PMID: 29588718 DOI: 10.15420/icr.2016:13:3] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
The identification of vulnerable atherosclerotic plaques in the coronary arteries is emerging as an important tool for guiding atherosclerosis diagnosis and interventions. Assessment of plaque vulnerability requires knowledge of both the structure and composition of the plaque. Intravascular photoacoustic (IVPA) imaging is able to show the morphology and composition of atherosclerotic plaque. With imminent improvements in IVPA imaging, it is becoming possible to assess human coronary artery disease in vivo. Although some challenges remain, IVPA imaging is on its way to being a powerful tool for visualising coronary atherosclerotic features that have been specifically associated with plaque vulnerability and clinical syndromes, and thus such imaging might become valuable for clinical risk assessment in the catheterisation laboratory.
Collapse
Affiliation(s)
- Min Wu
- Department of Biomedical Engineering, Thorax Centre, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Antonius Fw van der Steen
- Department of Biomedical Engineering, Thorax Centre, Erasmus Medical Center, Rotterdam, The Netherlands.,Interuniversity Cardiology Institute of The Netherlands, Netherlands Heart Institute, Utrecht, The Netherlands.,Department of Imaging Science and Technology, Delft University of Technology, Delft, The Netherlands.,Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Evelyn Regar
- Department of interventional cardiology, Thorax Center, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Gijs van Soest
- Department of Biomedical Engineering, Thorax Centre, Erasmus Medical Center, Rotterdam, The Netherlands
| |
Collapse
|
43
|
Hui J, Cheng JX. Converting Molecular Vibration to Mechanical Wave for Bond-Selective Imaging of Deep Tissue. CHINESE J CHEM PHYS 2015. [DOI: 10.1063/1674-0068/28/cjcp1504069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|
44
|
Wang P, Ma T, Slipchenko MN, Liang S, Hui J, Shung KK, Roy S, Sturek M, Zhou Q, Chen Z, Cheng JX. High-speed intravascular photoacoustic imaging of lipid-laden atherosclerotic plaque enabled by a 2-kHz barium nitrite raman laser. Sci Rep 2014; 4:6889. [PMID: 25366991 PMCID: PMC4219167 DOI: 10.1038/srep06889] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 10/14/2014] [Indexed: 11/09/2022] Open
Abstract
Lipid deposition inside the arterial wall is a key indicator of plaque vulnerability. An intravascular photoacoustic (IVPA) catheter is considered a promising device for quantifying the amount of lipid inside the arterial wall. Thus far, IVPA systems suffered from slow imaging speed (~50 s per frame) due to the lack of a suitable laser source for high-speed excitation of molecular overtone vibrations. Here, we report an improvement in IVPA imaging speed by two orders of magnitude, to 1.0 s per frame, enabled by a custom-built, 2-kHz master oscillator power amplifier (MOPA)-pumped, barium nitrite [Ba(NO3)2] Raman laser. This advancement narrows the gap in translating the IVPA technology to the clinical setting.
Collapse
Affiliation(s)
- Pu Wang
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, 47906, USA
| | - Teng Ma
- Department of Biomedical Engineering, NIH Ultrasonic Transducer Resource Center, University of Southern California, Los Angeles, California 90089, USA
| | - Mikhail N Slipchenko
- 1] Weldon School of Biomedical Engineering, Purdue University, West Lafayette, 47906, USA [2] Spectral Energy, LLC, Dayton, Ohio, 45431, USA
| | - Shanshan Liang
- 1] Department of Biomedical Engineering, University of California, Irvine, California 92697, USA [2] Beckman Laser Institute, University of California, Irvine, California 92612, USA and Edwards Lifesciences Center for Advanced Cardiovascular Technology, University of California, Irvine, California 92697, USA
| | - Jie Hui
- Physics Department, Purdue University, West Lafayette, 47906, USA
| | - K Kirk Shung
- Department of Biomedical Engineering, NIH Ultrasonic Transducer Resource Center, University of Southern California, Los Angeles, California 90089, USA
| | - Sukesh Roy
- Spectral Energy, LLC, Dayton, Ohio, 45431, USA
| | - Michael Sturek
- Department of Cellular &Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana, 46202, USA
| | - Qifa Zhou
- Department of Biomedical Engineering, NIH Ultrasonic Transducer Resource Center, University of Southern California, Los Angeles, California 90089, USA
| | - Zhongping Chen
- Department of Biomedical Engineering, University of California, Irvine, California 92697, USA
| | - Ji-Xin Cheng
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, 47906, USA
| |
Collapse
|
45
|
Schoenhagen P, Vince DG. Intravascular Photoacoustic Tomography of Coronary Atherosclerosis. J Am Coll Cardiol 2014; 64:391-3. [DOI: 10.1016/j.jacc.2014.05.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 05/20/2014] [Indexed: 11/26/2022]
|
46
|
Jansen K, van Soest G, van der Steen AFW. Intravascular photoacoustic imaging: a new tool for vulnerable plaque identification. ULTRASOUND IN MEDICINE & BIOLOGY 2014; 40:1037-48. [PMID: 24631379 DOI: 10.1016/j.ultrasmedbio.2014.01.008] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 01/06/2014] [Accepted: 01/07/2014] [Indexed: 05/13/2023]
Abstract
The vulnerable atherosclerotic plaque is believed to be at the root of the majority of acute coronary events. Even though the exact origins of plaque vulnerability remain elusive, the thin-cap fibroatheroma, characterized by a lipid-rich necrotic core covered by a thin fibrous cap, is considered to be the most prominent type of vulnerable plaque. No clinically available imaging technique can characterize atherosclerotic lesions to the extent needed to determine plaque vulnerability prognostically. Intravascular photoacoustic imaging (IVPA) has the potential to take a significant step in that direction by imaging both plaque structure and composition. IVPA is a natural extension of intravascular ultrasound that adds tissue type specificity to the images. IVPA utilizes the optical contrast provided by the differences in the absorption spectra of plaque components to image composition. Its capability to image lipids in human coronary atherosclerosis has been shown extensively ex vivo and has recently been translated to an in vivo animal model. Other disease markers that have been successfully targeted are calcium and inflammatory markers, such as macrophages and matrix metalloproteinase; the latter two through application of exogenous contrast agents. By simultaneously displaying plaque morphology and composition, IVPA can provide a powerful prognostic marker for disease progression, and as such has the potential to transform the current practice in percutaneous coronary intervention.
Collapse
Affiliation(s)
- Krista Jansen
- Department of Biomedical Engineering, Thorax Centre, Erasmus University Medical Center, Rotterdam, The Netherlands; Interuniversity Cardiology Institute of The Netherlands-Netherlands Heart Institute, Utrecht, The Netherlands
| | - Gijs van Soest
- Department of Biomedical Engineering, Thorax Centre, Erasmus University Medical Center, Rotterdam, The Netherlands.
| | - Antonius F W van der Steen
- Department of Biomedical Engineering, Thorax Centre, Erasmus University Medical Center, Rotterdam, The Netherlands; Interuniversity Cardiology Institute of The Netherlands-Netherlands Heart Institute, Utrecht, The Netherlands; Department of Imaging Science and Technology, Delft University of Technology, Delft, The Netherlands
| |
Collapse
|
47
|
Li X, Li J, Jing J, Ma T, Liang S, Zhang J, Mohar D, Raney A, Mahon S, Brenner M, Patel P, Shung KK, Zhou Q, Chen Z. Integrated IVUS-OCT Imaging for Atherosclerotic Plaque Characterization. IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS : A PUBLICATION OF THE IEEE LASERS AND ELECTRO-OPTICS SOCIETY 2014; 20:7100108. [PMID: 24771992 DOI: 10.1109/jstqe.2013.2265302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
For the diagnosis of atherosclerosis, biomedical imaging techniques such as intravascular ultrasound (IVUS) and optical coherence tomography (OCT) have been developed. The combined use of IVUS and OCT is hypothesized to remarkably increase diagnostic accuracy of vulnerable plaques. We have developed an integrated IVUS-OCT imaging apparatus, which includes the integrated catheter, motor drive unit, and imaging system. The dual-function imaging catheter has the same diameter of current clinical standard. The imaging system is capable for simultaneous IVUS and OCT imaging in real time. Ex vivo and in vivo experiments on rabbits with atherosclerosis were conducted to demonstrate the feasibility and superiority of the integrated intravascular imaging modality.
Collapse
Affiliation(s)
- Xiang Li
- NIH Ultrasonic Transducer Resource Center and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Jiawen Li
- Department of Biomedical Engineering, the Edwards Life Sciences Center for Advanced Cardiovascular Technology, and Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| | - Joe Jing
- Department of Biomedical Engineering and Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| | - Teng Ma
- NIH Ultrasonic Transducer Resource Center and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Shanshan Liang
- Department of Biomedical Engineering and Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| | - Jun Zhang
- Department of Biomedical Engineering and Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| | - Dilbahar Mohar
- Division of Cardiology, Irvine Medical Center, University of California, Orange, CA 92868 USA
| | - Aidan Raney
- Division of Cardiology, Irvine Medical Center, University of California, Orange, CA 92868 USA
| | - Sari Mahon
- Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| | - Matthew Brenner
- Division of Pulmonary and Critical Care, Irvine Medical Center, University of California, Orange, CA 92868 USA
| | - Pranav Patel
- Edwards Life Sciences Center for Advanced Cardiovascular Technology, University of California, Irvine, CA 92697 USA
| | - K Kirk Shung
- NIH Ultrasonic Transducer Resource Center and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Qifa Zhou
- NIH Ultrasonic Transducer Resource Center and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Zhongping Chen
- Department of Biomedical Engineering, the Edwards Life Sciences Center for Advanced Cardiovascular Technology, and Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| |
Collapse
|
48
|
Johnson JL, van Wijk K, Sabick M. Characterizing phantom arteries with multi-channel laser ultrasonics and photo-acoustics. ULTRASOUND IN MEDICINE & BIOLOGY 2014; 40:513-520. [PMID: 24412169 DOI: 10.1016/j.ultrasmedbio.2013.10.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 09/07/2013] [Accepted: 10/08/2013] [Indexed: 06/03/2023]
Abstract
Multi-channel photo-acoustic and laser ultrasonic waves are used to sense the characteristics of proxies for healthy and diseased vessels. The acquisition system is non-contacting and non-invasive with a pulsed laser source and a laser vibrometer detector. As the wave signatures of our targets are typically low in amplitude, we exploit multi-channel acquisition and processing techniques. These are commonly used in seismology to improve the signal-to-noise ratio of data. We identify vessel proxies with a diameter on the order of 1 mm, at a depth of 18 mm. Variations in scattered and photo-acoustic signatures are related to differences in vessel wall properties and content. The methods described have the potential to improve imaging and better inform interventions for atherosclerotic vessels, such as the carotid artery.
Collapse
Affiliation(s)
- Jami L Johnson
- Mechanical and Biomedical Engineering Department, Boise State University, Boise, Idaho, USA; Department of Physics, University of Auckland, Auckland, New Zealand.
| | - Kasper van Wijk
- Department of Physics, University of Auckland, Auckland, New Zealand
| | - Michelle Sabick
- Mechanical and Biomedical Engineering Department, Boise State University, Boise, Idaho, USA
| |
Collapse
|
49
|
Li X, Li J, Jing J, Ma T, Liang S, Zhang J, Mohar D, Raney A, Mahon S, Brenner M, Patel P, Shung KK, Zhou Q, Chen Z. Integrated IVUS-OCT Imaging for Atherosclerotic Plaque Characterization. IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS : A PUBLICATION OF THE IEEE LASERS AND ELECTRO-OPTICS SOCIETY 2014; 20:7100108. [PMID: 24771992 PMCID: PMC3996710 DOI: 10.1109/jstqe.2013.2274724] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
For the diagnosis of atherosclerosis, biomedical imaging techniques such as intravascular ultrasound (IVUS) and optical coherence tomography (OCT) have been developed. The combined use of IVUS and OCT is hypothesized to remarkably increase diagnostic accuracy of vulnerable plaques. We have developed an integrated IVUS-OCT imaging apparatus, which includes the integrated catheter, motor drive unit, and imaging system. The dual-function imaging catheter has the same diameter of current clinical standard. The imaging system is capable for simultaneous IVUS and OCT imaging in real time. Ex vivo and in vivo experiments on rabbits with atherosclerosis were conducted to demonstrate the feasibility and superiority of the integrated intravascular imaging modality.
Collapse
Affiliation(s)
- Xiang Li
- NIH Ultrasonic Transducer Resource Center and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Jiawen Li
- Department of Biomedical Engineering, the Edwards Life Sciences Center for Advanced Cardiovascular Technology, and Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| | - Joe Jing
- Department of Biomedical Engineering and Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| | - Teng Ma
- NIH Ultrasonic Transducer Resource Center and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Shanshan Liang
- Department of Biomedical Engineering and Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| | - Jun Zhang
- Department of Biomedical Engineering and Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| | - Dilbahar Mohar
- Division of Cardiology, Irvine Medical Center, University of California, Orange, CA 92868 USA
| | - Aidan Raney
- Division of Cardiology, Irvine Medical Center, University of California, Orange, CA 92868 USA
| | - Sari Mahon
- Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| | - Matthew Brenner
- Division of Pulmonary and Critical Care, Irvine Medical Center, University of California, Orange, CA 92868 USA
| | - Pranav Patel
- Edwards Life Sciences Center for Advanced Cardiovascular Technology, University of California, Irvine, CA 92697 USA
| | - K. Kirk Shung
- NIH Ultrasonic Transducer Resource Center and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Qifa Zhou
- NIH Ultrasonic Transducer Resource Center and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Zhongping Chen
- Department of Biomedical Engineering, the Edwards Life Sciences Center for Advanced Cardiovascular Technology, and Beckman Laser Institute, University of California, Irvine, CA 92697 USA
| |
Collapse
|
50
|
Yan X, Lam KH, Li X, Chen R, Ren W, Ren X, Zhou Q, Shung KK. Lead-free intravascular ultrasound transducer using BZT-50BCT ceramics. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2013; 60:1272-6. [PMID: 25004492 PMCID: PMC4090606 DOI: 10.1109/tuffc.2013.2692] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
This paper reports the fabrication and evaluation of a high-frequency ultrasonic transducer based on a new lead-free piezoelectric material for intravascular imaging application. Lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO4(BZT-50BCT) ceramic with a high dielectric constant (~2800) was employed to develop a high-frequency (~30 MHz) needle-type ultrasonic transducer. With superior piezoelectric performance (piezoelectric coefficient d33 ~ 600 pC/N), the lead-free transducer was found to exhibit a -6-dB bandwidth of 53% with an insertion loss of 18.7 dB. In vitro intravascular ultrasound (IVUS) imaging of a human cadaver coronary artery was performed to demonstrate the potential of the lead-free transducer for biomedical imaging applications. This is the first time that a lead-free transducer has been used for IVUS imaging application. The experimental results suggest that the BZT-50BCT ceramic is a promising lead-free piezoelectric material for high-frequency intravascular imaging applications.
Collapse
|