1
|
Wang G, Deng H, Ma M, Zhong X. Polar coordinate Fourier single-pixel imaging. OPTICS LETTERS 2023; 48:743-746. [PMID: 36723578 DOI: 10.1364/ol.479806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Accepted: 01/03/2023] [Indexed: 06/18/2023]
Abstract
Traditional single-pixel imaging uses Fourier patterns to modulate objects in the Cartesian coordinate system. The Cartesian Fourier pattern of single-pixel imaging is inappropriate to display in a circular field of view. However, a circular field of view is a widespread form of display in computed optical imaging. Here, circular patterns are adopted to adapt to the circular visual area. The circular patterns are displayed in polar coordinates and derived from two-dimensional Fourier transform in polar coordinates. The proposed circular patterns have improved imaging efficiency significantly from 63.66% to 100%. The proposed polar coordinate Fourier single-pixel imaging is expected to be applied in circular field-of-view imaging and foveated imaging.
Collapse
|
2
|
Park J, Brady DJ, Zheng G, Tian L, Gao L. Review of bio-optical imaging systems with a high space-bandwidth product. ADVANCED PHOTONICS 2021; 3:044001. [PMID: 35178513 PMCID: PMC8849623 DOI: 10.1117/1.ap.3.4.044001] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Optical imaging has served as a primary method to collect information about biosystems across scales-from functionalities of tissues to morphological structures of cells and even at biomolecular levels. However, to adequately characterize a complex biosystem, an imaging system with a number of resolvable points, referred to as a space-bandwidth product (SBP), in excess of one billion is typically needed. Since a gigapixel-scale far exceeds the capacity of current optical imagers, compromises must be made to obtain either a low spatial resolution or a narrow field-of-view (FOV). The problem originates from constituent refractive optics-the larger the aperture, the more challenging the correction of lens aberrations. Therefore, it is impractical for a conventional optical imaging system to achieve an SBP over hundreds of millions. To address this unmet need, a variety of high-SBP imagers have emerged over the past decade, enabling an unprecedented resolution and FOV beyond the limit of conventional optics. We provide a comprehensive survey of high-SBP imaging techniques, exploring their underlying principles and applications in bioimaging.
Collapse
Affiliation(s)
- Jongchan Park
- University of California, Department of Bioengineering, Los Angeles, California, United States
| | - David J. Brady
- University of Arizona, James C. Wyant College of Optical Sciences, Tucson, Arizona, United States
| | - Guoan Zheng
- University of Connecticut, Department of Biomedical Engineering, Storrs, Connecticut, United States
- University of Connecticut, Department of Electrical and Computer Engineering, Storrs, Connecticut, United States
| | - Lei Tian
- Boston University, Department of Electrical and Computer Engineering, Boston, Massachusetts, United States
| | - Liang Gao
- University of California, Department of Bioengineering, Los Angeles, California, United States
| |
Collapse
|
3
|
Niu Y, Chang J, Lv F, Shen B, Chen W. Low-cost dynamic real-time foveated imager. APPLIED OPTICS 2017; 56:7915-7920. [PMID: 29047778 DOI: 10.1364/ao.56.007915] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 08/31/2017] [Indexed: 06/07/2023]
Abstract
Foveated imaging systems have the ability to capture local high-resolution or high-magnification images with wide field of view (FOV); thus, they have great potential for applications in the field of monitoring and remote sensing of unmanned aerial vehicles. Hence, foveated optical systems are in strong demand. However, the existing foveated imaging systems either are equipped with expensive modulators or require fixing the local high resolution imaging field, which is not suitable for mass production or object tracking in industrial applications. We propose a low-cost dynamic real-time foveated imaging system for extensive use in the listed applications. Specifically, we place a microlens behind the first intermediary image plane to modulate the local focal length, constructing a local high magnification imaging channel. One two-axis translation stage drives the microlens to scan in the plane perpendicular to the optical axis, resulting in dynamic local high magnifying imaging. Furthermore, the peripheral imaging channel and the foveated imaging channel focus on the same detector, and the post image fusion is unnecessary; the system consists of only a common aspherical lens and thus is very inexpensive. The experimental system has a focal length of 25 mm, a full FOV of 30°, and an entrance pupil diameter of 5 mm, while the local high magnifying imaging channel has a focal length of 35 mm and FOV of 15°. Experiment results show that the low-cost dynamic real-time foveated imaging system performs very well.
Collapse
|
4
|
Shourav MK, Kim K, Kim S, Kim JK. Wide Field-of-View Fluorescence Imaging with Optical-Quality Curved Microfluidic Chamber for Absolute Cell Counting. MICROMACHINES 2016; 7:mi7070125. [PMID: 30404297 PMCID: PMC6189810 DOI: 10.3390/mi7070125] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Revised: 07/12/2016] [Accepted: 07/13/2016] [Indexed: 01/14/2023]
Abstract
Field curvature and other aberrations are encountered inevitably when designing a compact fluorescence imaging system with a simple lens. Although multiple lens elements can be used to correct most such aberrations, doing so increases system cost and complexity. Herein, we propose a wide field-of-view (FOV) fluorescence imaging method with an unconventional optical-quality curved sample chamber that corrects the field curvature caused by a simple lens. Our optics simulations and proof-of-concept experiments demonstrate that a curved substrate with lens-dependent curvature can reduce greatly the distortion in an image taken with a conventional planar detector. Following the validation study, we designed a curved sample chamber that can contain a known amount of sample volume and fabricated it at reasonable cost using plastic injection molding. At a magnification factor of approximately 0.6, the curved chamber provides a clear view of approximately 119 mm², which is approximately two times larger than the aberration-free area of a planar chamber. Remarkably, a fluorescence image of microbeads in the curved chamber exhibits almost uniform intensity over the entire field even with a simple lens imaging system, whereas the distorted boundary region has much lower brightness than the central area in the planar chamber. The absolute count of white blood cells stained with a fluorescence dye was in good agreement with that obtained by a commercially available conventional microscopy system. Hence, a wide FOV imaging system with the proposed curved sample chamber would enable us to acquire an undistorted image of a large sample volume without requiring a time-consuming scanning process in point-of-care diagnostic applications.
Collapse
Affiliation(s)
- Mohiuddin Khan Shourav
- Department of Mechanical Engineering, Graduate School, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, Korea.
| | - Kyunghoon Kim
- School of Mechanical Systems Engineering, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, Korea.
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, USA.
| | - Subin Kim
- Department of Mechanical Engineering, Graduate School, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, Korea.
| | - Jung Kyung Kim
- Department of Mechanical Engineering, Graduate School, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, Korea.
- School of Mechanical Systems Engineering, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, Korea.
| |
Collapse
|
5
|
Shadfan A, Hellebust A, Richards-Kortum R, Tkaczyk T. Confocal foveated endomicroscope for the detection of esophageal carcinoma. BIOMEDICAL OPTICS EXPRESS 2015; 6. [PMID: 26203363 PMCID: PMC4505691 DOI: 10.1364/boe.6.002311] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
By mimicking the variable resolution of the human eye, a newly designed foveated endomicroscopic objective shows the potential to improve current endoscopic based techniques of identifying abnormal tissue in the esophagus and colon. The prototype miniature foveated objective is imaged with a confocal microscope to provide large field of view images combined with a high resolution central region to rapidly observe morphological structures associated with cancer development in a mouse model.
Collapse
|
6
|
Spring BQ, Palanisami A, Hasan T. Microscale receiver operating characteristic analysis of micrometastasis recognition using activatable fluorescent probes indicates leukocyte imaging as a critical factor to enhance accuracy. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:066006. [PMID: 24919449 PMCID: PMC4053439 DOI: 10.1117/1.jbo.19.6.066006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 05/12/2014] [Accepted: 05/16/2014] [Indexed: 06/03/2023]
Abstract
Molecular-targeted probes are emerging with applications for optical biopsy of cancer. An underexplored potential clinical use of these probes is to monitor residual cancer micrometastases that escape cytoreductive surgery and chemotherapy. Here, we show that leukocytes, or white blood cells, residing in nontumor tissues--as well as those infiltrating micrometastatic lesions--uptake cancer cell-targeted, activatable immunoconjugates nonspecifically, which limits the accuracy and resolution of micrometastasis recognition using these probes. Receiver operating characteristic analysis of freshly excised tissues from a mouse model of peritoneal carcinomatosis suggests that dual-color imaging, adding an immunostain for leukocytes, offers promise for enabling accurate recognition of single cancer cells. Our results indicate that leukocyte identification improves micrometastasis recognition sensitivity and specificity from 92 to 93%--for multicellular metastases >20 to 30 μm in size--to 98 to 99.9% for resolving metastases as small as a single cell.
Collapse
Affiliation(s)
- Bryan Q. Spring
- Massachusetts General Hospital and Harvard Medical School, Wellman Center for Photomedicine, Boston, Massachusetts 02114
| | - Akilan Palanisami
- Massachusetts General Hospital and Harvard Medical School, Wellman Center for Photomedicine, Boston, Massachusetts 02114
| | - Tayyaba Hasan
- Massachusetts General Hospital and Harvard Medical School, Wellman Center for Photomedicine, Boston, Massachusetts 02114
- Massachusetts General Hospital, Department of Dermatology, Boston, Massachusetts 02114
- Harvard University and Massachusetts Institute of Technology, Division of Health Sciences and Technology, Cambridge, Massachusetts 02139
| |
Collapse
|
7
|
Selective treatment and monitoring of disseminated cancer micrometastases in vivo using dual-function, activatable immunoconjugates. Proc Natl Acad Sci U S A 2014; 111:E933-42. [PMID: 24572574 DOI: 10.1073/pnas.1319493111] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Drug-resistant micrometastases that escape standard therapies often go undetected until the emergence of lethal recurrent disease. Here, we show that it is possible to treat microscopic tumors selectively using an activatable immunoconjugate. The immunoconjugate is composed of self-quenching, near-infrared chromophores loaded onto a cancer cell-targeting antibody. Chromophore phototoxicity and fluorescence are activated by lysosomal proteolysis, and light, after cancer cell internalization, enabling tumor-confined photocytotoxicity and resolution of individual micrometastases. This unique approach not only introduces a therapeutic strategy to help destroy residual drug-resistant cells but also provides a sensitive imaging method to monitor micrometastatic disease in common sites of recurrence. Using fluorescence microendoscopy to monitor immunoconjugate activation and micrometastatic disease, we demonstrate these concepts of "tumor-targeted, activatable photoimmunotherapy" in a mouse model of peritoneal carcinomatosis. By introducing targeted activation to enhance tumor selectively in complex anatomical sites, this study offers prospects for catching early recurrent micrometastases and for treating occult disease.
Collapse
|
8
|
Qin Y, Hua H, Nguyen M. Multiresolution foveated laparoscope with high resolvability. OPTICS LETTERS 2013; 38:2191-3. [PMID: 23811873 PMCID: PMC4900147 DOI: 10.1364/ol.38.002191] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A key limitation of the state-of-the-art laparoscopes for minimally invasive surgery is the tradeoff between the field of view and spatial resolution in a single-view camera system. As such, surgical procedures are usually performed at a zoomed-in view, which limits the surgeon's ability to see much outside the immediate focus of interest and causes a situational awareness challenge. We proposed a multiresolution foveated laparoscope (MRFL) aiming to address this limitation. The MRFL is able to simultaneously capture wide-angle overview and high-resolution images in real time; it can scan and engage the high-resolution images to any subregion of the entire surgical field in analogy to the fovea of human eye. The MRFL is able to render equivalently 10 million pixel resolution with a low data bandwidth requirement. The system has a large working distance (WD) from 80 to 180 mm. The spatial resolvability is about 45 μm in the object space at an 80 mm WD, while the resolvability of a conventional laparoscope is about 250 μm at a typically 50 mm surgical distance.
Collapse
Affiliation(s)
- Yi Qin
- 3D Visualization and Imaging Systems Laboratory, College of Optical Sciences, University of Arizona, 1630 East University Boulevard, Tucson, Arizona 85721, USA
| | - Hong Hua
- 3D Visualization and Imaging Systems Laboratory, College of Optical Sciences, University of Arizona, 1630 East University Boulevard, Tucson, Arizona 85721, USA
| | - Mike Nguyen
- Department of Surgery, University of Arizona, 1501 N. Campbell Ave., Tucson, Arizona 85724, USA
| |
Collapse
|