IPEM-translation最新文献_第3页

Detection accuracy of I-125 seeds and needle tips, in MRI prostate tissue mimicking material: Phantom design, fabrication, and testing I-125种子和针尖的检测精度，在MRI前列腺组织模拟材料:幻影设计，制造和测试

IPEM-translation Pub Date : 2022-11-01 DOI: 10.1016/j.ipemt.2022.100013

Sarah Wilby , Antonio De Stefano , Antony L. Palmer , Wojciech Polak , Petko Petkov , Andrea Bucchi

{"title":"Detection accuracy of I-125 seeds and needle tips, in MRI prostate tissue mimicking material: Phantom design, fabrication, and testing","authors":"Sarah Wilby , Antonio De Stefano , Antony L. Palmer , Wojciech Polak , Petko Petkov , Andrea Bucchi","doi":"10.1016/j.ipemt.2022.100013","DOIUrl":"10.1016/j.ipemt.2022.100013","url":null,"abstract":"<div><p>Accurately identifying needle tip and seed positions for low dose rate prostate brachytherapy on MRI images is challenging. Uncertainties in locating needle tip positions can lead to misplacement of seeds compared to planned coordinates. Furthermore uncertainty in establishing true seed positions on the images, leads to uncertainty in the dose distributions.</p><p>In this study, a novel phantom has been designed for the analysis of I-125 seed and needle tip detection and tip image distortion. The phantom utilises a gel that mimics prostate tissue in MRI, to evaluate the uncertainty in establishing seed and needle tip positions. Reults are reported for the IsoSeed (Bebig) source, in clinically relevant seed arrangements, and for a novel nitinol needle.</p><p>The choice of MRI sequence impacts the accuracy of detecting the needle tips and seeds. This is most prevelant when the seeds are in clusters, at the boundary of the prostate and at 90˚ to the long axis of the scanner. Detected needle tip position, when the MRI metal artefact correction algorithm was used, was measured consistently inferior to the actual position (mean tip at -2.3 ± 1.5 mm (<em>k</em> = 2), <em>p</em> = 0.03).</p><p>We have demonstrated the design of a phantom that can be used to quantitatively assess seed and needle tip positions simultaneously, to establish the accuracy of detection, or presence of artefacts on MRI.</p></div>","PeriodicalId":73507,"journal":{"name":"IPEM-translation","volume":"3 ","pages":"Article 100013"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667258822000103/pdfft?md5=07f5323035227a20463e192a7b1fad15&pid=1-s2.0-S2667258822000103-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43445884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Special issue—Sharing of best practices in response to the COVID-19 pandemic 特刊:分享应对COVID-19大流行的最佳做法

IPEM-translation Pub Date : 2022-11-01 DOI: 10.1016/j.ipemt.2022.100014

Richard A. Black

引用次数: 0

Portable X-rays–A new era? 便携式x光机——一个新时代?

IPEM-translation Pub Date : 2022-11-01 DOI: 10.1016/j.ipemt.2022.100005

Deborah Henderson , Stuart Mark , David Rawlings , Kevin Robson

引用次数: 1

Assessing the performance of 360∘ ultrasound probes designed for endoanal ultrasound 评估为肛门内超声设计的360∘超声探头的性能

IPEM-translation Pub Date : 2022-07-01 DOI: 10.1016/j.ipemt.2022.100007

James Harkin, Steve Perring

{"title":"Assessing the performance of 360∘ ultrasound probes designed for endoanal ultrasound","authors":"James Harkin, Steve Perring","doi":"10.1016/j.ipemt.2022.100007","DOIUrl":"10.1016/j.ipemt.2022.100007","url":null,"abstract":"<div><p>A bespoke phantom has been designed, with clinically relevant features for endoanal ultrasound (EAUS), capable of rigorously assessing the performance of 360<span><math><msup><mrow></mrow><mo>∘</mo></msup></math></span> ultrasound probes.</p><p>The performance of three, commercially available, anorectal probes, capable of producing both 2D and 3D images, was assessed. One of the probes was also assessed in two states: before failure and after a repair to correct a failure. For each probe the signal to noise ratio (SNR), contrast to noise ratio (CNR), penetration depth, resolution, focus depth, distance accuracy and low contrast object detectability (LCOD) were assessed at varying dynamic ranges, receive gains and operating frequencies. A Python program (SAUQA) was developed to semi-automate the analysis.</p><p>In general the measured parameters varied as expected. However, at intermediate receive gains, adjusting the receive gain resulted in the SNR, CNR, penetration depth and LCOD varying in an unexpected manner. The reason for this is not known, but because it was exhibited by all probes it is believed to be related to the ultrasound machine itself and/or an inherent characteristic of the probe design.</p><p>The quantitative results suggest that all probes tested offer an effective method of assessing the integrity of the Internal Anal Sphincter (IAS) and the repair of the probe appears to have been successful. However, differences between the probes were observed both quantitatively and qualitatively, with the original probe providing the best results for EAUS.</p><p>In light of the results, a recommendation was made, to the EAUS service at University Hospitals Dorset, to adjust the default machine start-up settings for EAUS.</p></div>","PeriodicalId":73507,"journal":{"name":"IPEM-translation","volume":"2 ","pages":"Article 100007"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266725882200005X/pdfft?md5=a73125e7c3c56fbb5741258b6fbf469c&pid=1-s2.0-S266725882200005X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45359589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of SNR Assessment Techniques for Routine Multi-Element RF Coil QC Testing 常规多元件射频线圈QC测试信噪比评估技术的比较

IPEM-translation Pub Date : 2022-07-01 DOI: 10.1016/j.ipemt.2022.100012

James Harkin , Cameron Ingham

{"title":"Comparison of SNR Assessment Techniques for Routine Multi-Element RF Coil QC Testing","authors":"James Harkin , Cameron Ingham","doi":"10.1016/j.ipemt.2022.100012","DOIUrl":"https://doi.org/10.1016/j.ipemt.2022.100012","url":null,"abstract":"<div><p>In the UK, the Institute of Physics and Engineering in Medicine (IPEM) provides guidance to Medical Physics departments on appropriate Quality Control (QC) tests to evaluate MRI scanners used in routine clinical practice. The method recommended for the rigorous annual assessment of the SNR produced by RF coils uses a sequence and regions of interest (ROIs) recommended by IPEM, and calculates SNR through a subtraction calculation (<em>IPEM recommended Method</em>). This method was compared to alternative methods proposed by NessAiver at the 2019 American Association of Physicists in Medicine meeting in their talk on RF coil testing. Comparisons were completed for sequences and regions of interest (ROIs) recommended by IPEM and NessAiver. Testing was performed at 1.5 T using the scanner’s integrated body coil and at 3.0 T using a peripheral Head/Neck coil. Calculation of SNR using the mean of the background noise, assessed using the NessAiver recommended sequence and ROIs (<em>NessAiver Noise-Average Method</em>), typically offered the lowest variability in SNR results. Additionally, the SNR results produced by the <em>IPEM Recommended Method</em> were less repeatable than those from the <em>NessAiver Noise-Average Method</em> (p<span><math><mo><</mo></math></span>0.001). Furthermore, the significance level to which a simulated reduction in SNR could be detected using the <em>IPEM Recommended Method</em> (p<span><math><mo><</mo></math></span>0.001) was less than with the <em>NessAiver Noise-Average Method</em> (p<span><math><mo>≥</mo></math></span>0.0031). Finally, when comparing the test duration of each method, use of the <em>NessAiver Noise-Average Method</em> results in a 90% reduction in acquisition time per SNR result, when compared to the <em>IPEM Recommended Method</em>.</p></div>","PeriodicalId":73507,"journal":{"name":"IPEM-translation","volume":"2 ","pages":"Article 100012"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667258822000097/pdfft?md5=18c9bd0cedea3190d70ab73b7506c6df&pid=1-s2.0-S2667258822000097-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"109217379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A standardised template for reporting lower limb kinematic waveform movement compensations from a sensor-based portable clinical movement analysis toolkit 基于传感器的便携式临床运动分析工具包中用于报告下肢运动波形运动补偿的标准化模板

IPEM-translation Pub Date : 2022-04-01 DOI: 10.1016/j.ipemt.2021.100001

K Button , M Felemban , JL Davies , K Nicholas , J Parry-Williams , Q Muaidi , M Al-Amri

{"title":"A standardised template for reporting lower limb kinematic waveform movement compensations from a sensor-based portable clinical movement analysis toolkit","authors":"K Button , M Felemban , JL Davies , K Nicholas , J Parry-Williams , Q Muaidi , M Al-Amri","doi":"10.1016/j.ipemt.2021.100001","DOIUrl":"10.1016/j.ipemt.2021.100001","url":null,"abstract":"<div><h3>Objectives</h3><p>To develop a standardised template to support physiotherapist reporting of lower limb kinematic waveform data</p></div><div><h3>Design</h3><p>Within and between user agreement identification of movement compensation strategies.</p></div><div><h3>Setting</h3><p>University Health Board Physiotherapy Department</p></div><div><h3>Participants</h3><p>Fourteen individuals with anterior cruciate ligament reconstruction performed overground gait, double-leg squat, and stair ascent wearing body-worn sensors. Six users viewed 252 kinematic waveforms of hip, knee and ankle joint angles in the sagittal and frontal planes.</p></div><div><h3>Main outcome measures</h3><p>Between and within-user observed agreement and themes from movement analysis reports</p></div><div><h3>Results</h3><p>Between-user observed agreement for presence of a movement compensation was 0.6–0.9 for the sagittal plane and 0.75–1.0 for the frontal place. Within-user observed agreement was 0.57–1.00 for the sagittal plane and 0.71–1.00 for the frontal plane. Three themes and seven categories were identified from the waveform interpretations: Amount (qualitative and quantitative description), timing (phase, discrete time point, cycle), and nature (peak, range of motion, timing) of the compensation.</p></div><div><h3>Conclusion</h3><p>There was good agreement between users at identifying the presence of movement compensation from the kinematic waveforms, but there was variation in how movement compensations were described. An interactive report, a standardised template for interpretation of kinematic waveforms, and training to support the clinical application of a movement analysis toolkit are proposed.</p></div>","PeriodicalId":73507,"journal":{"name":"IPEM-translation","volume":"1 ","pages":"Article 100001"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667258821000017/pdfft?md5=f5cda8c9ff5164d4e90f1623a7d9c7bf&pid=1-s2.0-S2667258821000017-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44418040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterizing sensor accuracy requirements in an artificial intelligence-enabled medical device 表征支持人工智能的医疗设备中的传感器精度要求

IPEM-translation Pub Date : 2022-04-01 DOI: 10.1016/j.ipemt.2022.100004

Kristin A. Bartlett, Katharine E. Forth, Stefan I. Madansingh

引用次数: 0

Finite Element Analysis of Identifying Breast Cancer Tumor Grades Through Frequency Spectral Variation of High-Frequency Ultrasound 高频超声频谱变化识别乳腺癌肿瘤分级的有限元分析

IPEM-translation Pub Date : 2022-04-01 DOI: 10.1016/j.ipemt.2022.100003

Koushik Paul , Jeremy Stromer , Samuel Razmi , Barbara A. Pockaj , Leila Ladani

{"title":"Finite Element Analysis of Identifying Breast Cancer Tumor Grades Through Frequency Spectral Variation of High-Frequency Ultrasound","authors":"Koushik Paul , Jeremy Stromer , Samuel Razmi , Barbara A. Pockaj , Leila Ladani","doi":"10.1016/j.ipemt.2022.100003","DOIUrl":"10.1016/j.ipemt.2022.100003","url":null,"abstract":"<div><p>Ultrasound analysis is an instantaneous characterization tool to evaluate microstructural inhomogeneity. In this study, computational high-frequency ultrasound analysis was conducted to characterize histological features of malignant breast tissue. A high-frequency ultrasound signal was sent through the soft tissue model in a through-transmission manner. Histological features of the soft tissue were categorized as cell shape, nuclear pleomorphism, and malignant cell density. The design of experiment was created by combining various levels of histological features of tumor tissue. Transmitted ultrasound frequency spectrums from all combinations of histological features were analyzed in terms of peak density and mean peak to valley distance (MPVD) parameters. For the circular-shaped cell model, peak density and MPVD responded with increasing and decreasing trends respectively while the malignant histological features became gradually dominant. For the elliptical-shaped cell model, only peak density was effective to establish a relationship with the histological features. It was observed that added malignant cells had more contribution to the response parameters than nuclear pleomorphism. Furthermore, the frequency spectrum patterns from all histological combinations were evaluated to find further information about malignant features.</p></div>","PeriodicalId":73507,"journal":{"name":"IPEM-translation","volume":"1 ","pages":"Article 100003"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667258822000012/pdfft?md5=0fe5502f18bdcd3cec110874a19918b9&pid=1-s2.0-S2667258822000012-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44236071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Introducing IPEM–Translation 引入IPEM-Translation

IPEM-translation Pub Date : 2022-04-01 DOI: 10.1016/j.ipemt.2021.100002

Editor-in-Chief Richard A. Black (PhD CEng FIMechE FIPEM)

引用次数: 0

Editorial: Introducing IPEM–Translation 编辑:介绍ipem翻译

IPEM-translation Pub Date : 2021-12-01 DOI: 10.1016/j.ipemt.2021.100002

Richard A. Black

引用次数: 0