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Assessment of the Image Quality and Diagnostic Accuracy of Coronary CT Angiography: Effect of Sublingual Administration of Nitroglycerin

Doo Kyung Kang, Hyun Woo Noh, Kyung Joo Park, So Yeon Choi
2007 Journal of the Korean Radiological Society  
The volume-rendering image (A) shows significant lumen reduction (arrow) at the mid-LAD.  ...  Table 2 . 2 Diagnostic Accuracy of Coronary CTA for Detecting Significant Stenosis Analysis Pre-medication Sensitivity (%) Specificity (%) PPV (%) NPV (%) Accuracy (%) Per-segments No NTG (n=151  ...  Assessment of the Image Quality and Diagnostic Accuracy of Coronary Forty three patients underwent coronary CTA without medication (the non-administrated group), while 38 patients were given 0.6 mg NTG  ... 
doi:10.3348/jkrs.2007.56.2.127 fatcat:nwnahfkyoraevcuxq32jcckjxu

Evaluating the potential and problems of three-dimensional computed tomography measurements of arterial stenosis

David S. Ebert, David G. Heath, Brian S. Kuszyk, Linglan Edwards, Christopher D. Shaw, James Kukla, Ted Bedwell, Elliot K. Fishman
1998 Journal of digital imaging  
Volume visualization is gaining widespread acceptance in medical applications. As its use increases, the issue of accuracy becomes critical.  ...  Parameters that produce realistic images often provide inaccurate measurements.  ...  Fig 1 . 1 Two example volume rendered images from a 66% stenosed data set $howing the range of images that can be produced from the same data, Fig 4 . 4 Range of images generated by the volume raycaster  ... 
doi:10.1007/bf03168738 pmid:9718505 pmcid:PMC3453197 fatcat:y4p47gko4ncalok3ma6fgkwaum

Index [chapter]

2021 Image Processing for Automated Diagnosis of Cardiac Diseases  
analysis, 206-208 reference image, 206-208 statistical analysis, 209-211, 211t, 212f visual analysis, 209, 209-211f Medical image fusion process, 196 Medical image registration, 22, 23f Medical  ...  image segmentation, 68, 68t Medical imaging, 106-107 computers role in, 100-101 convolutional neural networks (CNN) in, 66-68, 67f decision forests (DF) in, 65-66, 66t machine learning (ML) in, 106  ... 
doi:10.1016/b978-0-323-85064-3.09998-2 fatcat:wrnfugc4tjaw3k7lyhz75kmfca

Feasibility of offline head & neck adaptive radiotherapy using deformed planning CT electron density mapping on weekly cone beam computed tomography

Anantharaman Ayyalusamy, Subramani Vellaiyan, Subramanian Shanmugam, Arivarasan Ilamurugu, Arun Gandhi, Thirumalaiswamy Shanmugam, Kathirvel Murugesan
2017 British Journal of Radiology  
The cumulative mean dose difference for Planning target volume 66 Gy (PTV 66 ) was 21.35 6 1.71% and for Planning target volume 60 Gy (PTV 60 ), it was 20.69 6 1.37%.  ...  Conclusion: The results from the study showed that it is clinically feasible to estimate the dose-volume relationship using deformed pCT.  ...  Clinical target volume 66 Gy and 60 Gy (CTV 66 and CTV 60 ), parotids and spinal cord were the structures selected for analysis. Volume reduction and dice similarity index (DSI) were determined.  ... 
doi:10.1259/bjr.20160420 pmid:27781491 pmcid:PMC5605016 fatcat:pabuxf3zvvcfvjdzdc53egmp6u

Comparison of CT images with average intensity projection, free breathing, and mid-ventilation for dose calculation in lung cancer

Chirasak Khamfongkhruea, Sangutid Thongsawad, Chirapha Tannanonta, Sasikarn Chamchod
2017 Journal of Applied Clinical Medical Physics  
AIP image sets seemed to be suitable for dose calculation while patient movement between series acquisition of FB images should be considered when defining target volumes on 4DCT images.  ...  A gamma index analysis was also performed to compare dose distributions.  ...  CT images of the thorax were acquired as normal FB and 4DCT scans using a helical 16-slice Brilliance Big Bore CT scanner (Philips Medical Systems, Cleveland, OH, USA).  ... 
doi:10.1002/acm2.12037 pmid:28300381 pmcid:PMC5689962 fatcat:vvageikz2jbdnolbn6c6vwp6ge

Association between hippocampus volume and symptom profiles in obsessive–compulsive disorder

Tim Jonas Reess, Oana Georgiana Rus, Deniz A. Gürsel, Benita Schmitz-Koep, Gerd Wagner, Götz Berberich, Kathrin Koch
2018 NeuroImage: Clinical  
In addition, hippocampal volumes of the different symptom profile groups were compared with hippocampal volumes in a sample of 66 healthy controls.  ...  score, depression, medication, disease duration and scanner.  ...  Of note, the ENIGMA meta-analysis identified hippocampal volume differences to be larger in medicated patients, however, no relationship with symptoms was found.  ... 
doi:10.1016/j.nicl.2017.11.006 pmid:29159060 pmcid:PMC5683038 fatcat:fllfo47wknhmfofoc3cmtqhdve

Volumetric image-guided highly conformal radiotherapy of the prostate bed: Toxicity analysis

Gianluca Ingrosso, Alessandra Carosi, Daniela di Cristino, Elisabetta Ponti, Andrea Lancia, Alessandra Murgia, Claudia Bruni, Pasquale Morelli, Franca Pietrasanta, Riccardo Santoni
2017 Reports of Practical Oncology & Radiotherapy  
At Cox analysis, acute grade ≥2 GU toxicity is correlated with the percentage of bladder volume receiving more than 65 Gy (p = 0.02, HR 1.87 CI 1.25-2.8), and the maximal dose to the rectum is correlated  ...  Aim: To evaluate toxicity of high conformal image-guided radiotherapy of the prostate bed.  ...  Dose-volume-histograms (DVHs) were used to provide a quantitative analysis.  ... 
doi:10.1016/j.rpor.2016.10.006 pmid:27920610 pmcid:PMC5126144 fatcat:swtby2gzxnb4xp5owfegmdfzdi

Improved Quantification of Myocardium Scar in Late Gadolinium Enhancement Images: Deep Learning Based Image Fusion Approach

Ahmed S Fahmy, Ethan J Rowin, Raymond H Chan, Warren J Manning, Martin S Maron, Reza Nezafat
2021 Journal of Magnetic Resonance Imaging  
Manual and CNN-based quantifications of LGE scar burden and of myocardial volume were assessed using Pearson linear correlation coefficients (r) and Bland-Altman analysis.  ...  Quantification of myocardium scarring in late gadolinium enhanced (LGE) cardiac magnetic resonance imaging can be challenging due to low scar-to-background contrast and low image quality.  ...  volume (Volume LGE-cine = 18 + 0.91 × Volume manual , r = 0.96; 66 patients, 603 slices).  ... 
doi:10.1002/jmri.27555 pmid:33599043 pmcid:PMC8359184 fatcat:nvbfjuaaevgxlemftaoew2vt2q

Progressive Gray Matter Reduction of the Superior Temporal Gyrus During Transition to Psychosis

Tsutomu Takahashi, Stephen J. Wood, Alison R. Yung, Bridget Soulsby, Patrick D. McGorry, Michio Suzuki, Yasuhiro Kawasaki, Lisa J. Phillips, Dennis Velakoulis, Christos Pantelis
2009 Archives of General Psychiatry  
Context: Longitudinal magnetic resonance imaging studies have shown progressive gray matter reduction in the superior temporal gyrus during the earliest phases of schizophrenia.  ...  For cross-sectional comparison at baseline and second imaging, the absolute STG volume was assessed by means of a repeatedmeasures analysis of variance with ICV as a covariate (analysis of covariance [  ...  The medication status was unknown for 4 patients at the first imaging.  ... 
doi:10.1001/archgenpsychiatry.2009.12 pmid:19349306 fatcat:o2jboigqevfylk3wn2mqqbygfu

A Voxel-Based Diffusion Tensor Imaging Study of White Matter in Bipolar Disorder

Katie Mahon, Jinghui Wu, Anil K Malhotra, Katherine E Burdick, Pamela DeRosse, Babak A Ardekani, Philip R Szeszko
2009 Neuropsychopharmacology  
Tractography was performed in template space on averaged diffusion tensor imaging data from all individuals.  ...  In this study, we compared fractional anisotropy (FA) values between 30 patients with bipolar disorder and 38 healthy volunteers in the brain white matter using a voxelwise analysis following intersubject  ...  Magnetic Resonance Imaging Procedures Magnetic resonance imaging examinations were conducted at the Long Island Jewish Medical Center on a GE 1.5 T system.  ... 
doi:10.1038/npp.2008.216 pmid:19145224 pmcid:PMC2811531 fatcat:r6wglxeez5aj3euqkqqbbxxr24

Outcomes of Endovascular Thrombectomy vs Medical Management Alone in Patients With Large Ischemic Cores

Amrou Sarraj, Ameer E. Hassan, Sean Savitz, Clark Sitton, James Grotta, Peng Chen, Chunyan Cai, Gary Cutter, Bita Imam, Sujan Reddy, Kaushik Parsha, Deep Pujara (+9 others)
2019 JAMA Neurology  
This prespecified analysis of the Optimizing Patient's Selection for Endovascular Treatment in Acute Ischemic Stroke (SELECT) trial, a prospective cohort study of imaging selection that was conducted in  ...  The median (interquartile range) age was 66 (60-75) years; 45 patients (43%) were female.  ...  Sensitivity Analysis for Ischemic Core Volume Greater Than 70 cm 3 To assess 2 different ischemic core volume cutoffs (>70 cm 3 and >50 cm 3 ), a sensitivity analysis was performed to evaluate the likelihood  ... 
doi:10.1001/jamaneurol.2019.2109 pmid:31355873 pmcid:PMC6664381 fatcat:kw27235amndapm3zsjhuv3ko6q

医用画像解析における機械学習の活用
Application of Machine Learning in Medical Image Analysis

Kensaku MORI
2017 Medical Imaging and Information Sciences  
Examples of medical image analysis applications using machine learning techniques are presented in this short manuscript.  ...  This paper presents a brief overview of applications of machine learning in medical image analysis. We explain machine learning from Bayes Theorem and traditional statistical pattern recognition.  ...  Surg., 2017 (in press) . [ 15 ] Matsuzaki T, Oda M, Kitasaka T, et al. : Automated anatomical labeling of abdominal arteries and hepatic portal system extracted from abdominal CT volumes, Med.  ... 
doi:10.11318/mii.34.66 fatcat:ujyako6j25dsrgkbadcc3yxlmq

Prostatic volume determination by transabdominal ultrasonography: Does accuracy vary significantly with urinary bladder volumes between 50 to 400 mL?

Edmund K. Brakohiapa, Benard O. Botwe, Benjamin D. Sarkodie
2019 Journal of Medical Radiation Sciences  
(V2 = 100-199 mL, V3 = 200-299 mL and V4 = 300-399 mL), in 66 males.  ...  Urinary bladder volume of 50-99 mL produces prostatic volume measurements comparable to volumes measured in patients with a full (300-399 mL), or nearly full urinary bladder (200-299 mL).  ...  Subsequently, 66 participants were conveniently selected.  ... 
doi:10.1002/jmrs.320 pmid:30737908 pmcid:PMC6545479 fatcat:e3f7kahssffnfbu5rdwltgzd5e

OC33.02: Fetal cardiac ejection fraction assessed from 4D ultrasound: spatio-temporal image correlation and volume calculation

L. U. Larsen, N. Uldbjerg, E. Sloth, K. Sorensen, O. B. Petersen
2005 Ultrasound in Obstetrics and Gynecology  
Oral communication abstracts volume (SV), cardiac output (CO) and total vascular resistance. Simultaneous FBC, electrolyte count, and renin, aldosterone and ANF levels were measured.  ...  College of Medicine, Asan Medical Center, South Korea (EF) based on systolic and diastolic volume of the left ventricle.  ...  The identification rate dropped from 66% to less than 16% in less experienced hands. 02 Fetal cardiac ejection fraction assessed from 4D ultrasound: spatio-temporal image correlation and volume calculation  ... 
doi:10.1002/uog.2200 fatcat:n3ymit4jkjdrpmiziqswuu6qgy

Automated segmentation of mammary gland regions in non-contrast X-ray CT images

Xiangrong Zhou, Mingxu Han, Takeshi Hara, Hiroshi Fujita, Keiko Sugisaki, Huayue Chen, Gobert Lee, Ryujiro Yokoyama, Masayuki Kanematsu, Hiroaki Hoshi
2008 Computerized Medical Imaging and Graphics  
generated manually by 2 medical experts independently for each CT case.  ...  The result showed that the mean value of the JSC score was 0.83 with the standard deviation of 0.09 for 66 CT cases.  ...  The volume ratio of the dense tissue regions and total mammary gland regions is regarded as the final output of breast density analysis.  ... 
doi:10.1016/j.compmedimag.2008.08.007 pmid:18849142 fatcat:dt347na3prayjajyovamqgizta
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