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Cho HM, Hong C, Lee C, Ding H, Kim T, Ahn B. LEGO-compatible modular mapping phantom for magnetic resonance imaging. Sci Rep 2020; 10:14755. [PMID: 32901056 PMCID: PMC7478958 DOI: 10.1038/s41598-020-71279-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 08/10/2020] [Indexed: 11/30/2022] Open
Abstract
Physical phantoms have been widely used for performance evaluation of magnetic resonance imaging (MRI). Although there are many kinds of physical phantoms, most MRI phantoms use fixed configurations with specific sizes that may fit one or a few different types of radio frequency (RF) coils. Therefore, it has limitations for various image quality assessments of scanning areas. In this article, we report a novel design for a truly customizable MRI phantom called the LEGO-compatible Modular Mapping (MOMA) phantom, which not only serves as a general quality assurance phantom for a wide range of RF coils, but also a flexible calibration phantom for quantitative imaging. The MOMA phantom has a modular architecture which includes individual assessment functionality of the modules and LEGO-type assembly compatibility. We demonstrated the feasibility of the MOMA phantom for quantitative evaluation of image quality using customized module assembly compatible with head, breast, spine, knee, and body coil features. This unique approach allows comprehensive image quality evaluation with wide versatility. In addition, we provide detailed MOMA phantom development and imaging characteristics of the modules.
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Affiliation(s)
- Hyo-Min Cho
- Safety Measurement Institute, Korea Research Institute of Standards and Science (KRISS), Daejeon, 34113, Republic of Korea
| | - Cheolpyo Hong
- Department of Radiological Science, Daegu Catholic University, Gyeongsan-si, 38430, Gyeongbuk, Republic of Korea
| | - Changwoo Lee
- Safety Measurement Institute, Korea Research Institute of Standards and Science (KRISS), Daejeon, 34113, Republic of Korea
| | - Huanjun Ding
- Department of Radiological Sciences, University of California, Irvine, CA, 92697, USA
| | - Taeho Kim
- Department of Radiation Oncology, Washington University, Saint Louis, MO, 63110, USA
| | - Bongyoung Ahn
- Safety Measurement Institute, Korea Research Institute of Standards and Science (KRISS), Daejeon, 34113, Republic of Korea.
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Green L. Variation in Breast MRI Quality. Acad Radiol 2020; 27:476-477. [PMID: 31911037 DOI: 10.1016/j.acra.2019.11.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 11/30/2019] [Indexed: 11/26/2022]
Affiliation(s)
- Lauren Green
- Department of Radiology, University of Illinois Hospital and Health Sciences, 1740 W Taylor St 2600, Chicago, IL 60642.
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He Y, Liu Y, Dyer BA, Boone JM, Liu S, Chen T, Zheng F, Zhu Y, Sun Y, Rong Y, Qiu J. 3D-printed breast phantom for multi-purpose and multi-modality imaging. Quant Imaging Med Surg 2019; 9:63-74. [PMID: 30788247 DOI: 10.21037/qims.2019.01.05] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Background Breast imaging technology plays an important role in breast cancer planning and treatment. Recently, three-dimensional (3D) printing technology has become a trending issue in phantom constructions for medical applications, with its advantages of being customizable and cost-efficient. However, there is no current practice in the field of multi-purpose breast phantom for quality control (QC) in multi-modalities imaging. The purpose of this study was to fabricate a multi-purpose breast phantom with tissue-equivalent materials via a 3D printing technique for QC in multi-modalities imaging. Methods We used polyvinyl chloride (PVC) based materials and a 3D printing technique to construct a breast phantom. The phantom incorporates structures imaged in the female breast such as microcalcifications, fiber lesions, and tumors with different sizes. Moreover, the phantom was used to assess the sensitivity of lesion detection, depth resolution, and detectability thresholds with different imaging modalities. Phantom tissue equivalent properties were determined using computed tomography (CT) attenuation [Hounsfield unit (HU)] and magnetic resonance imaging (MRI) relaxation times. Results The 3D-printed breast phantom had an average background value of 36.2 HU, which is close to that of glandular breast tissue (40 HU). T1 and T2 relaxation times had an average relaxation time of 206.81±17.50 and 20.22±5.74 ms, respectively. Mammographic imaging had improved detection of microcalcification compared with ultrasound and MRI with multiple sequences [T1WI, T2WI and short inversion time inversion recovery (STIR)]. Soft-tissue lesion detection and cylindrical tumor contrast were superior with mammography and MRI compared to ultrasound. Hemispherical tumor detection was similar regardless of the imaging modality used. Conclusions We developed a multi-purpose breast phantom using a 3D printing technique and determined its value for multi-modal breast imaging studies.
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Affiliation(s)
- Yaoyao He
- Medical Engineering and Technology Center, Taishan Medical University, Taian 271016, China
| | - Yulin Liu
- Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China
| | - Brandon A Dyer
- Department of Radiation Oncology, University of California Davis Medical Center, Sacramento, CA 95630, USA
| | - John M Boone
- Department of Radiology, University of California Davis Medical Center, Sacramento, California 95817, USA
| | - Shanshan Liu
- Department of Radiology, Affiliated Hospital of Taishan Medical University, Taian 271016, China
| | - Tiao Chen
- Medical Engineering and Technology Center, Taishan Medical University, Taian 271016, China.,Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China
| | - Fenglian Zheng
- Medical Engineering and Technology Center, Taishan Medical University, Taian 271016, China
| | - Ye Zhu
- Medical Engineering and Technology Center, Taishan Medical University, Taian 271016, China
| | - Yong Sun
- Medical Engineering and Technology Center, Taishan Medical University, Taian 271016, China
| | - Yi Rong
- Department of Radiation Oncology, University of California Davis Medical Center, Sacramento, CA 95630, USA
| | - Jianfeng Qiu
- Medical Engineering and Technology Center, Taishan Medical University, Taian 271016, China
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Quantitative magnetic resonance imaging phantoms: A review and the need for a system phantom. Magn Reson Med 2017; 79:48-61. [DOI: 10.1002/mrm.26982] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 09/01/2017] [Accepted: 10/04/2017] [Indexed: 01/16/2023]
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Borri M, Scurr ED, Richardson C, Usher M, Leach MO, Schmidt MA. A novel approach to evaluate spatial resolution of MRI clinical images for optimization and standardization of breast screening protocols. Med Phys 2016; 43:6354. [PMID: 27908180 DOI: 10.1118/1.4966704] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 09/27/2016] [Accepted: 10/17/2016] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Stringent quality assurance is required in MRI breast screening to ensure that different scanners and imaging protocols reach similar diagnostic performance. The authors propose a methodology, based on power spectrum analysis (PSA), to evaluate spatial resolution in clinical images. To demonstrate this approach, the authors have retrospectively compared two MRI sequences commonly employed in breast screening. METHODS In a novel approach to PSA, spatial frequency response curves (SFRCs) were extracted from the images. The SFRC characterizes spatial resolution describing the spatial frequency content of an image over a range of frequencies. Verification of the SFRCs was performed on MRI images of Eurospin agarose gel tubes acquired with different resolution settings. SFRCs of volunteer and patient images obtained with two clinical MRI sequences were then compared. The two sequences differed primarily in k-space coverage pattern, which was either radial (RAD) or linear (LIN). RESULTS The computed SFRCs were able to demonstrate the differences between RAD and LIN sequences in relatively small groups of subjects. The curves showed a similar pattern of decay in both volunteer and patient images, indicating that the spatial frequency response is mainly determined by the imaging protocol and not by intersubject anatomical differences. The LIN protocol produced images with increased sharpness; this was reflected in the corresponding SFRCs, which showed a higher content of spatial frequencies associated with image details. CONCLUSIONS The SFRC can provide an objective assessment of the presence of spatial details in the image and represent a useful quality assurance tool in the evaluation of different breast screening protocols. With a reference image, a comparative analysis of the SFRCs could ensure that equivalent image quality is achieved across different scanners and sites.
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Affiliation(s)
- Marco Borri
- CR-UK Cancer Imaging Centre, The Royal Marsden NHS Foundation Trust and The Institute of Cancer Research, London SM2 5PT, United Kingdom
| | - Erica D Scurr
- Department of Radiology, The Royal Marsden NHS Foundation Trust, London SM2 5PT, United Kingdom
| | - Cheryl Richardson
- Department of Radiology, The Royal Marsden NHS Foundation Trust, London SM2 5PT, United Kingdom
| | - Marianne Usher
- Department of Radiology, The Royal Marsden NHS Foundation Trust, London SM2 5PT, United Kingdom
| | - Martin O Leach
- CR-UK Cancer Imaging Centre, The Royal Marsden NHS Foundation Trust and The Institute of Cancer Research, London SM2 5PT, United Kingdom
| | - Maria A Schmidt
- CR-UK Cancer Imaging Centre, The Royal Marsden NHS Foundation Trust and The Institute of Cancer Research, London SM2 5PT, United Kingdom
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Song J, Li J, Zheng H. Clinical effects of quality control circle activity in patients with gastrointestinal diseases. Shijie Huaren Xiaohua Zazhi 2016; 24:3529-3532. [DOI: 10.11569/wcjd.v24.i23.3529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To explore the clinical effect of quality control circle activity in the prevention of hospital infection in patients with gastrointestinal diseases, in order to provide a reference for the prevention of hospital infection in patients with gastrointestinal diseases.
METHODS: One thousand patients treated at Zhongning County People's Hospital from January 2013 to December 2015 were randomized into either a control group or a study group. The control group received conventional nursing care, and the study group received new type nursing care through quality care circle activity. Clinical effects were compared between the two groups.
RESULTS: The nosocomial infection rate was significantly lower in the study group than in the control group (1.4% vs 3.6%, P < 0.05). The rate of satisfaction with nursing care was significantly higher in the study group than in the control group (96.0% vs 72.0%, P < 0.05).
CONCLUSION: Implementation of quality control circle activity in patients with gastrointestinal diseases can prevent the occurrence of hospital infections and improve patient satisfaction.
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Keenan KE, Peskin AP, Wilmes LJ, Aliu SO, Jones EF, Li W, Kornak J, Newitt DC, Hylton NM. Variability and bias assessment in breast ADC measurement across multiple systems. J Magn Reson Imaging 2016; 44:846-55. [PMID: 27008431 DOI: 10.1002/jmri.25237] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 02/29/2016] [Indexed: 12/19/2022] Open
Abstract
PURPOSE To assess the ability of a recent, anatomically designed breast phantom incorporating T1 and diffusion elements to serve as a quality control device for quantitative comparison of apparent diffusion coefficient (ADC) measurements calculated from diffusion-weighted MRI (DWI) within and across MRI systems. MATERIALS AND METHODS A bilateral breast phantom incorporating multiple T1 and diffusion tissue mimics and a geometric distortion array was imaged with DWI on 1.5 Tesla (T) and 3.0T scanners from two different manufacturers, using three different breast coils (three configurations total). Multiple measurements were acquired to assess the bias and variability of different diffusion weighted single-shot echo-planar imaging sequences on the scanner-coil systems. RESULTS The repeatability of ADC measurements was mixed: the standard deviation relative to baseline across scanner-coil-sequences ranged from low variability (0.47, 95% confidence interval [CI]: 0.22-1.00) to high variability (1.69, 95% CI: 0.17-17.26), depending on material, with the lowest and highest variability from the same scanner-coil-sequence. Assessment of image distortion showed that right/left measurements of the geometric distortion array were 1 to 16% larger on the left coil side compared with the right coil side independent of scanner-coil systems, diffusion weighting, and phase-encoding direction. CONCLUSION This breast phantom can be used to measure scanner-coil-sequence bias and variability for DWI. When establishing a multisystem study, this breast phantom may be used to minimize protocol differences (e.g., due to available sequences or shimming technique), to correct for bias that cannot be minimized, and to weigh results from each system depending on respective variability. J. Magn. Reson. Imaging 2016. J. MAGN. RESON. IMAGING 2016;44:846-855.
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Affiliation(s)
- Kathryn E Keenan
- Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado, USA.
| | - Adele P Peskin
- Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado, USA
| | - Lisa J Wilmes
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - Sheye O Aliu
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - Ella F Jones
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - Wen Li
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - John Kornak
- Department of Epidemiology and Biostatistics, University of California, San Francisco, California, USA
| | - David C Newitt
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - Nola M Hylton
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
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Keenan KE, Wilmes LJ, Aliu SO, Newitt DC, Jones EF, Boss MA, Stupic KF, Russek SE, Hylton NM. Design of a breast phantom for quantitative MRI. J Magn Reson Imaging 2016; 44:610-9. [PMID: 26949897 DOI: 10.1002/jmri.25214] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 02/12/2016] [Indexed: 11/05/2022] Open
Abstract
PURPOSE We present a breast phantom designed to enable quantitative assessment of measurements of T1 relaxation time, apparent diffusion coefficient (ADC), and other attributes of breast tissue, with long-term support from a national metrology institute. MATERIALS AND METHODS A breast phantom was created with two independent, interchangeable units for diffusion and T1 /T2 relaxation, each with flexible outer shells. The T1 unit was filled with corn syrup solution and grapeseed oil to mimic the relaxation behavior of fibroglandular and fatty tissues, respectively. The diffusion unit contains plastic tubes filled with aqueous solutions of polyvinylpyrrolidone (PVP) to modulate the ADC. The phantom was imaged at 1.5T and 3.0T using magnetic resonance imaging (MRI) scanners and common breast coils from multiple manufacturers to assess T1 and T2 relaxation time and ADC values. RESULTS The fibroglandular mimic exhibited target T1 values on 1.5T and 3.0T clinical systems (25-75 percentile range: 1289 to 1400 msec and 1533 to 1845 msec, respectively) across all bore temperatures. PVP solutions mimicked the range of ADC values from malignant tumors to normal breast tissue (40% PVP median: 633 × 10(-6) mm(2) /s to 0% PVP median: 2231 × 10(-6) mm(2) /s) at temperatures of 17-24°C. The interchangeable phantom units allowed both the diffusion and T1 /T2 units to be tested on the left and right sides of the coil to assess any variation. CONCLUSION This phantom enables T1 and ADC measurements, fits in a variety of clinical breast coils, and can serve as a quality control tool to facilitate the standardization of quantitative measurements for breast MRI. J. Magn. Reson. Imaging 2016;44:610-619.
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Affiliation(s)
- Kathryn E Keenan
- Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado, USA
| | - Lisa J Wilmes
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - Sheye O Aliu
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - David C Newitt
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - Ella F Jones
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - Michael A Boss
- Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado, USA
| | - Karl F Stupic
- Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado, USA
| | - Stephen E Russek
- Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado, USA
| | - Nola M Hylton
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
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