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https://www.readbyqxmd.com/read/28072831/a-probabilistic-method-for-estimation-of-bowel-wall-thickness-in-mr-colonography
#1
Thomas Hampshire, Alex Menys, Asif Jaffer, Gauraang Bhatnagar, Shonit Punwani, David Atkinson, Steve Halligan, David J Hawkes, Stuart A Taylor
MRI has recently been applied as a tool to quantitatively evaluate the response to therapy in patients with Crohn's disease, and is the preferred choice for repeated imaging. Bowel wall thickness on MRI is an important biomarker of underlying inflammatory activity, being abnormally increased in the acute phase and reducing in response to successful therapy; however, a poor level of interobserver agreement of measured thickness is reported and therefore a system for accurate, robust and reproducible measurements is desirable...
2017: PloS One
https://www.readbyqxmd.com/read/28008722/evaluating-distribution-of-the-left-branch-of-the-middle-colic-artery-and-the-left-colic-artery-by-ct-angiography-and-colonography-to-classify-blood-supply-to-the-splenic-flexure
#2
Asako Fukuoka, Takahiro Sasaki, Satoshi Tsukikawa, Nobuyoshi Miyajima, Takehito Ostubo
INTRODUCTION: CT angiography has gained widespread acceptance for preoperative evaluation of blood supply in patients with colorectal cancer. However, there have been few reports that pertain to the splenic flexure, for which surgery is technically difficult. We used preoperative CT angiography and CT colonography to evaluate blood supply to the splenic flexure. METHODS: We defined the splenic flexure as the junction of the distal third of the transverse colon and the proximal third of the descending colon...
December 22, 2016: Asian Journal of Endoscopic Surgery
https://www.readbyqxmd.com/read/27936413/interactive-registration-between-supine-and-prone-scans-in-computed-tomography-colonography-using-band-height-images
#3
Youngchan Song, Hyunna Lee, Ho Chul Kang, Juneseuk Shin, Gil-Sun Hong, Seong Ho Park, Jeongjin Lee, Yeong-Gil Shin
In computed tomographic colonography (CTC), a patient is commonly scanned twice including supine and prone scans to improve the sensitivity of polyp detection. Typically, a radiologist must manually match the corresponding areas in the supine and prone CT scans, which is a difficult and time-consuming task, even for experienced scan readers. In this paper, we propose a method of supine-prone registration utilizing band-height images, which are directly constructed from the CT scans using a ray-casting algorithm containing neighboring shape information...
December 1, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/27932450/accuracy-of-diffusion-weighted-magnetic-resonance-colonography-in-assessing-mucosal-healing-and-the-treatment-response-in-patients-with-ulcerative-colitis
#4
Valérie Laurent, Sébastien Naudé, Lucine Vuitton, Camille Zallot, Cédric Bauman, Mélanie Girard-Gavanier, Laurent Peyrin-Biroulet
BACKGROUND & AIMS: Using sigmoidoscopy as the gold standard, we assessed the accuracy and responsiveness to change of diffusion-weighted magnetic resonance colonography in ulcerative colitis using the Nancy score. METHODS: 29 ulcerative colitis patients having undergone at least two diffusion-weighted magnetic resonance colonographies were included. Disease activity was evaluated using the Mayo endoscopic subscore and the Nancy score. We determined the accuracy of the Nancy score in the diagnosis of mucosal healing...
December 7, 2016: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/27925483/application-of-gray-level-mapping-in-computed-tomographic-colonography-a-pilot-study-to-compare-with-traditional-surface-rendering-method-for-identification-and-differentiation-of-endoluminal-lesions
#5
Lih-Shyang Chen, Ta-Wen Hsu, Shao-Jer Chen, Shu-Han Chang, Chih-Wen Lin, Yu-Ruei Chen, Chin-Chiang Hsieh, Shu-Chen Han, Ku-Yaw Chang, Chun-Ju Hou
OBJECTIVES: In traditional surface rendering (SR) Computed tomographic endoscopy, only shape of endoluminal lesion is depicted without gray level information unless the volume rendering technique is used. However volume rendering technique is relatively slow and complex in terms of computation time and parameter setting. We use computed tomographic colonography (CTC) images as examples and report a new visualization technique by three dimensional (3D) gray level mapping (GM) to better identify and differentiate endoluminal lesions...
December 7, 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27918709/spectral-photon-counting-ct-initial-experience-with-dual-contrast-agent-k-edge-colonography
#6
Daniela Muenzel, Daniel Bar-Ness, Ewald Roessl, Ira Blevis, Matthias Bartels, Alexander A Fingerle, Stefan Ruschke, Philippe Coulon, Heiner Daerr, Felix K Kopp, Bernhard Brendel, Axel Thran, Michal Rokni, Julia Herzen, Loic Boussel, Franz Pfeiffer, Roland Proksa, Ernst J Rummeny, Philippe Douek, Peter B Noël
Purpose To investigate the feasibility of using spectral photon-counting computed tomography (CT) to differentiate between gadolinium-based and nonionic iodine-based contrast material in a colon phantom by using the characteristic k edge of gadolinium. Materials and Methods A custom-made colon phantom was filled with nonionic iodine-based contrast material, and a gadolinium-filled capsule representing a contrast material-enhanced polyp was positioned on the colon wall. The colon phantom was scanned with a preclinical spectral photon-counting CT system to obtain spectral and conventional data...
December 2, 2016: Radiology
https://www.readbyqxmd.com/read/27895427/irritable-bowel-syndrome-evaluation-using-computed-tomography-colonography
#7
Hideki Ohgo, Hiroyuki Imaeda, Minoru Yamaoka, Kazuaki Yoneno, Naoki Hosoe, Takeshi Mizukami, Hidetomo Nakamoto
AIM: To evaluate the morphology of the colon in patients with irritable bowel syndrome (IBS) by using computed tomography colonography (CTC). METHODS: Twelve patients with diarrhea type IBS (IBS-D), 13 patients with constipation type IBS (IBS-C), 12 patients with functional constipation (FC) and 14 control patients underwent colonoscopy following CTC. The lengths of the rectosigmoid colon, transverse colon and the total colon were measured. The diameters of the rectum, sigmoid colon, descending colon, transverse colon, and ascending colon were measured...
November 14, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/27893377/high-performance-cad-ctc-scheme-using-shape-index-multiscale-enhancement-filters-and-radiomic-features
#8
Yacheng Ren, Jingchen Ma, Junfeng Xiong, Lin Lu, Jun Zhao
OBJECTIVE: Computer-aided detection (CAD) systems for computed tomography colonography (CTC) can automatically detect colorectal polyps. The main problem of currently developed CAD-CTC systems is the numerous false positives (FPs) caused by the existence of complicated colon structures (e.g., haustral fold, residual fecal material, inflation tube, and ileocecal valve). This study proposes a CAD-CTC scheme using shape index, multiscale enhancement filters, and radiomic features to address the FP issue...
November 22, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27882202/computed-tomography-colonography-phantom-construction-validation-and-literature-review
#9
Lukas Lambert, Alena Lambertova, Jan Danes, Gabriela Grusova
BACKGROUND: Several dedicated computed tomography (CT) colonography phantoms have been described previously. OBJECTIVES: To compare their pros and cons and describe the construction of a dedicated phantom that can be easily manufactured. MATERIALS AND METHODS: We found 15 different phantom designs by literature search and compared their advantages and disadvantages based on their description and images. We tested various materials for density and mechanical properties and constructed a phantom from polypropylene pipes (30 mm and 50 mm in diameter, 52 cm in length)...
October 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
https://www.readbyqxmd.com/read/27867950/review-capsule-colonoscopy-a-concise-clinical-overview-of-current-status
#10
REVIEW
Diana E Yung, Emanuele Rondonotti, Anastasios Koulaouzidis
The colon capsule endoscopy (CCE) was first introduced in 2007. Currently, the main clinical indications for CCE are completion of incomplete colonoscopy, polyp detection and investigation of inflammatory bowel disease (IBD). Although conventional colonoscopy is the gold standard in bowel cancer screening, incomplete colonoscopy remains a problem as lesions are missed. CCE compares favourably to computer tomography colonography (CTC) in adenoma detection and has therefore been proposed as a method for completing colonoscopy...
October 2016: Annals of Translational Medicine
https://www.readbyqxmd.com/read/27864601/predictors-of-primary-care-provider-adoption-of-ct-colonography-for-colorectal-cancer-screening
#11
Jennifer M Weiss, David H Kim, Maureen A Smith, Aaron Potvien, Jessica R Schumacher, Ronald E Gangnon, B Dustin Pooler, Patrick R Pfau, Perry J Pickhardt
PURPOSE: To examine factors influencing primary care provider (PCP) adoption of CT colonography (CTC) for colorectal cancer (CRC) screening. MATERIALS AND METHODS: We performed a retrospective cohort study linking electronic health record (EHR) data with PCP survey data. Patients were eligible for inclusion if they were not up-to-date with CRC screening and if they had CTC insurance coverage in the year prior to survey administration. PCPs were included if they had at least one eligible patient in their panel and completed the survey (final sample N = 95 PCPs; N = 6245 patients)...
November 19, 2016: Abdominal Radiology
https://www.readbyqxmd.com/read/27854032/haustral-loop-extraction-for-ct-colonography-using-geodesics
#12
Yongkai Liu, Chaijie Duan, Jerome Liang, Jing Hu, Hongbing Lu, Mingyue Luo
PURPOSE: The human colon has complex geometric structures because of its haustral folds, which are thin flat protrusions on the colon wall. The haustral loop is the curve (approximately triangular in shape) that encircles the highly convex region of the haustral fold, and is regarded as the natural landmark of the colon, intersecting the longitude of the colon in the middle. Haustral loop extraction can assist in reducing the structural complexity of the colon, and the loops can also serve as anatomic markers for computed tomographic colonography (CTC)...
November 16, 2016: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/27814436/national-survey-of-ct-colonography-practice-in-ireland
#13
A E Smyth, C F Healy, E A Aherne, P MacMathuna, M M Morrin, H M Fenlon
CT Colonography was first introduced to Ireland in 1999. Our aim of this study is to review current CT Colonography practices in the Republic of Ireland. A questionnaire on CT Colonography practice was sent to all non-maternity adult radiology departments in the Republic of Ireland with a CT scanner. The results are interpreted in the context of the recommendations on CT Colonography quality standards as published by the European Society of Gastrointestinal and Abdominal Radiology (ESGAR) consensus statement in the journal of European Radiology in 2013...
June 10, 2016: Irish Medical Journal
https://www.readbyqxmd.com/read/27783161/consequences-of-ct-colonography-in-stenosing-colorectal-cancer
#14
J F Huisman, L W Leicher, E de Boer, H L van Westreenen, J W de Groot, F A Holman, P C van de Meeberg, Pejm Sallevelt, Kcmj Peeters, Mnjm Wasser, Hfa Vasen, W H de Vos Tot Nederveen Cappel
BACKGROUND: In patients with stenosing colorectal cancer (CRC), visualization of the entire colon prior to surgery is recommended to exclude synchronous tumors. Therefore, most centers combine computed tomographic colonography (CTC) with staging CT. The aims of this study were to evaluate the yield and clinical implications of CTC. METHODS: In this multicenter retrospective study, patients with stenosing CRC that underwent CTC and subsequent surgery between April 2013 and November 2015 were included...
October 25, 2016: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/27779195/accuracy-of-ct-colonography-for-detection-of-polypoid-and-nonpolypoid-neoplasia-by-gastroenterologists-and-radiologists-a-nationwide-multicenter-study-in-japan
#15
Koichi Nagata, Shungo Endo, Tetsuro Honda, Takaaki Yasuda, Michiaki Hirayama, Sho Takahashi, Takashi Kato, Shoichi Horita, Ken Furuya, Kenji Kasai, Hiroshi Matsumoto, Yoshiki Kimura, Kenichi Utano, Hideharu Sugimoto, Hiroyuki Kato, Rieko Yamada, Junta Yamamichi, Takeshi Shimamoto, Yasuji Ryu, Osamu Matsui, Hitoshi Kondo, Ayako Doi, Taro Abe, Hiro-O Yamano, Ken Takeuchi, Hiroyuki Hanai, Yukihisa Saida, Katsuyuki Fukuda, Janne Näppi, Hiroyuki Yoshida
OBJECTIVES: The objective of this study was to assess prospectively the diagnostic accuracy of computer-assisted computed tomographic colonography (CTC) in the detection of polypoid (pedunculated or sessile) and nonpolypoid neoplasms and compare the accuracy between gastroenterologists and radiologists. METHODS: This nationwide multicenter prospective controlled trial recruited 1,257 participants with average or high risk of colorectal cancer at 14 Japanese institutions...
January 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/27718049/diagnosis-of-early-colorectal-cancer-invasion-depth-by-quantitative-evaluation-of-the-basal-indentation-in-ct-colonography
#16
Mitsutoshi Miyasaka, Daisuke Tsurumaru, Yusuke Nishimuta, Yoshiki Asayama, Satoshi Kawanami, Eiji Oki, Minako Hirahashi, Hiroshi Honda
OBJECTIVE: To investigate the feasibility of diagnosing the invasion depth of early colorectal cancer (CRC) by quantitatively evaluating the basal indentation (BI)-i.e., the intestinal lateral deformity-in CT colonography (CTC). MATERIALS AND METHODS: 34 early CRCs (13 Tis CRCs and 21 T1 CRCs) in 32 patients who underwent a preoperative CTC were retrospectively examined. Two radiologists calculated the depth of the BI on a computed tomographic air-contrast enema (CT enema) image, the depth of the BI due to the geometric function (BI-G) on a cross-sectional multiplanar reconstruction (CS-MPR) image, and the ratio of the BI to the BI-G (i...
December 2016: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/27689185/computed-tomographic-colonography-findings-in-ileocecal-tuberculosis
#17
Teruaki Iwano, Koichi Nagata, Atsushi Mima, Takashi Egawa, Hideyo Yamashita, Hiroshi Saito
No abstract text is available yet for this article.
September 2016: Journal of Gastrointestinal and Liver Diseases: JGLD
https://www.readbyqxmd.com/read/27679194/computed-tomographic-colonography-in-the-diagnosis-of-recto-sigmoid-endometriosis-a-pilot-study
#18
A Racca, E Biscaldi, V Remorgida, U Leone Roberti Maggiore, V G Vellone, P L Venturini, S Ferrero
No abstract text is available yet for this article.
November 2015: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/27669478/french-comment-on-article-terminal-digit-preference-biases-polyp-size-measurements-at-endoscopy-computed-tomographic-colonography-and-histopathology
#19
(no author information available yet)
No abstract text is available yet for this article.
October 2016: Endoscopy
https://www.readbyqxmd.com/read/27651020/combined-assessment-using-optical-colonoscopy-and-computed-tomographic-colonography-improves-the-determination-of-tumor-location-and-invasion-depth
#20
Hidenori Kanazawa, Kenichi Utano, Shigeyoshi Kijima, Takahiro Sasaki, Yasuyuki Miyakura, Hisanaga Horie, Alan Kawarai Lefor, Hideharu Sugimoto
INTRODUCTION: An accurate assessment of the depth of tumor invasion in patients with colon cancer is an important part of the preoperative evaluation. Whether computed tomographic colonography (CTC) or optical colonoscopy (OC) is better to accurately determine tumor location and invasion depth has not been definitively determined. The aim of this study was to determine the diagnostic accuracy of tumor localization and tumor invasion depth of colon cancer by preoperative OC alone or combined with CTC...
February 2017: Asian Journal of Endoscopic Surgery
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