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CT Colonography

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https://www.readbyqxmd.com/read/28600072/colorectal-cancer-screening-recommendations-for-physicians-and-patients-from-the-u-s-multi-society-task-force-on-colorectal-cancer
#1
Douglas K Rex, C Richard Boland, Jason A Dominitz, Francis M Giardiello, David A Johnson, Tonya Kaltenbach, Theodore R Levin, David Lieberman, Douglas J Robertson
This document updates the colorectal cancer (CRC) screening recommendations of the U.S. Multi-Society Task Force of Colorectal Cancer (MSTF), which represents the American College of Gastroenterology, the American Gastroenterological Association, and The American Society for Gastrointestinal Endoscopy. CRC screening tests are ranked in 3 tiers based on performance features, costs, and practical considerations. The first-tier tests are colonoscopy every 10 years and annual fecal immunochemical test (FIT). Colonoscopy and FIT are recommended as the cornerstones of screening regardless of how screening is offered...
June 2, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28581195/minimal-preparation-ct-a-literature-review-of-a-minimally-invasive-imaging-technique-for-colorectal-cancer-in-a-frail-aged-population
#2
REVIEW
Andrew D Csillag, Anna R Quirk, Michael V Chan, Lloyd J Ridley
Colorectal cancer (CRC) is a common malignancy with increased incidence in the elderly. When CRC is suspected, patients are typically evaluated with optical colonoscopy (OC) or CT Colonography (CTC). Unfortunately, in the frail and elderly patient, these investigations can be difficult to perform and are often not tolerated. Minimal preparation computed tomography (MPCT) is a CT technique to evaluate the colon. Although protocols vary, typically, no preparation is required apart from administration of oral contrast for faecal tagging...
June 5, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/28573348/measurement-of-smaller-colon-polyp-in-ct-colonography-images-using-morphological-image-processing
#3
K N Manjunath, P C Siddalingaswamy, G K Prabhu
PURPOSE: Automated measurement of the size and shape of colon polyps is one of the challenges in Computed tomography colonography (CTC). The objective of this retrospective study was to improve the sensitivity and specificity of smaller polyp measurement in CTC using image processing techniques. METHODS: A domain knowledge-based method has been implemented with hybrid method of colon segmentation, morphological image processing operators for detecting the colonic structures, and the decision-making system for delineating the smaller polyp-based on a priori knowledge...
June 1, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28570580/ct-volumetric-measurement-of-colorectal-cancer-helps-predict-tumor-staging-and-prognosis
#4
Jin Young Park, Se Hyung Kim, Sang Min Lee, Jeong Sub Lee, Joon Koo Han
PURPOSE: To evaluate feasibility of CT colonography (CTC) volumetry of colorectal cancer (CRC) and its correlation with disease stage and patients' survival. MATERIALS AND METHODS: CTC volumetry was performed for 126 patients who underwent preoperative CTC. Reproducibility of tumor volume (Tvol) between two readers was assessed. One-way ANOVA and ROC analysis evaluated correlation between Tvol and pTNM staging. ROC analysis compared diagnostic performance to predict pTNM staging between Tvol and radiologist...
2017: PloS One
https://www.readbyqxmd.com/read/28555630/colorectal-cancer-screening-recommendations-for-physicians-and-patients-from-the-u-s-multi-society-task-force-on-colorectal-cancer
#5
Douglas K Rex, C Richard Boland, Jason A Dominitz, Francis M Giardiello, David A Johnson, Tonya Kaltenbach, Theodore R Levin, David Lieberman, Douglas J Robertson
This document updates the colorectal cancer (CRC) screening recommendations of the U.S. Multi-Society Task Force of Colorectal Cancer (MSTF), which represents the American College of Gastroenterology, the American Gastroenterological Association, and The American Society for Gastrointestinal Endoscopy. CRC screening tests are ranked in 3 tiers based on performance features, costs, and practical considerations. The first-tier tests are colonoscopy every 10 years and annual fecal immunochemical test (FIT). Colonoscopy and FIT are recommended as the cornerstones of screening regardless of how screening is offered...
June 6, 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28522955/colonic-dysmotility-and-morphological-abnormality-frequently-detected-in-japanese-patients-with-irritable-bowel-syndrome
#6
Takeshi Mizukami, Shinya Sugimoto, Tatsuhiro Masaoka, Hidekazu Suzuki, Takanori Kanai
BACKGROUND/AIMS: Colonoscopy and computed tomography (CT) are used primarily to exclude organic diseases in patients with irritable bowel syndrome (IBS), rather than to assess the pathophysiology of IBS. We aimed to evaluate colonic dysmotility and morphology in Japanese patients with IBS. METHODS: One hundred eighty-four patients with IBS and 49 asymptomatic controls who underwent colonoscopy in combination with CT colonography or barium enema were retrospectively reviewed between 2008 and 2012...
April 2017: Intestinal Research
https://www.readbyqxmd.com/read/28503955/new-insights-into-the-earliest-stages-of-colorectal-tumorigenesis
#7
Chelsie K Sievers, William M Grady, Richard B Halberg, Perry J Pickhardt
Tumors in the large intestine have been postulated to arise via a stepwise accumulation of mutations, a process that takes up to 20 years. Recent advances in lineage tracing and DNA sequencing, however, are revealing new evolutionary models that better explain the vast amount of heterogeneity observed within and across colorectal tumors. Areas covered: A review of the literature supporting a novel model of colorectal tumor evolution was conducted. The following commentary examines the basic science and clinical evidence supporting a modified view of tumor initiation and progression in the colon...
May 26, 2017: Expert Review of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28447326/ct-colonography-role-in-fobt-based-screening-programs-for-colorectal-cancer
#8
REVIEW
Lapo Sali, Grazia Grazzini, Mario Mascalchi
Computed tomographic colonography (CTC) is a minimally invasive imaging examination for the colon, and is safe, well tolerated and accurate for the detection of colorectal cancer (CRC) and advanced adenoma. While the role of CTC as a primary test for population screening of CRC is under investigation, the fecal occult blood test (FOBT) has been recommended for population screening of CRC in Europe. Subjects with positive FOBT are invited to undergo total colonoscopy, which has some critical issues, such as suboptimal compliance, contraindications and the possibility of an incomplete exploration of the colon...
April 26, 2017: Clinical Journal of Gastroenterology
https://www.readbyqxmd.com/read/28390559/optimal-timing-for-faecal-tagging-in-same-day-ct-colonography-for-patients-with-failed-colonoscopy
#9
Sushant Saluja, Grazvydas Gaikstas, Milan Sapundzieski
AIM: Same day CT colonography (CTC) for incomplete colonoscopy should be considered to avoid the need for further bowel preparation. Oral administration of contrast is essential for optimal colonic analysis of the CTC. Our aim was to determine the optimal time for giving contrast to people who underwent same day CTC after failed colonoscopy. METHODS: Data was extracted from the Trust database to identify the number of CTC referrals following failed or incomplete colonoscopy within the last 5 years, and the reason for their referral...
May 2017: Radiography
https://www.readbyqxmd.com/read/28379020/-contribution-of-ct-colonography-to-clinical-practice
#10
Lukáš Lambert, Lucie Šimáková
CT colonography is a CT examination focused on the detection of colonic polyps and masses. Its most common indications include incomplete optical colonoscopy and generally personal preference in symptomatic or frail patients. CT colonography has a diagnostic yield similar to optical colonoscopy. It is less demanding for the patient, has shorter examination times, lower rates of adverse effects (including bowel perforation) and allows limited evaluation of extracolonic structures. In 10-15 % of asymptomatic patients, optical colonoscopy is needed if either a colonic polyp or mass is detected...
2017: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/28333541/extracolonic-findings-at-screening-ct-colonography-prevalence-benefits-challenges-and-opportunities
#11
B Dustin Pooler, David H Kim, Perry J Pickhardt
OBJECTIVE: Extracolonic findings at screening CT colonography (CTC) represent imaging findings incidentally detected outside the colon and rectum. Confusion regarding rates reported in the literature fuels controversy over the relative benefits versus harms of extracolonic findings. CONCLUSION: From an evidence-based approach, this article reviews the prevalence and benefits of and challenges raised by extracolonic findings, as well as opportunities to further leverage the effect of screening CTC...
March 23, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28281908/increasing-navigation-speed-at-endoluminal-ct-colonography-reduces-colonic-visualization-and-polyp-identification
#12
Andrew A Plumb, Peter Phillips, Graeme Spence, Susan Mallett, Stuart A Taylor, Steve Halligan, Thomas Fanshawe
Purpose To investigate the effect of increasing navigation speed on the visual search and decision making during polyp identification for computed tomography (CT) colonography Materials and Methods Institutional review board permission was obtained to use deidentified CT colonography data for this prospective reader study. After obtaining informed consent from the readers, 12 CT colonography fly-through examinations that depicted eight polyps were presented at four different fixed navigation speeds to 23 radiologists...
March 10, 2017: Radiology
https://www.readbyqxmd.com/read/28270290/application-of-low-tube-voltage-70-kv-and-advanced-modeled-iterative-reconstruction-in-the-third-generation-dual-source-ct-to-ct-colonography
#13
Jingjuan Liu, Weidong Pan, Huadan Xue, Bin Li, Xuan Wang, Hao Sun, Yun Wang, Wei Liu, Zhengyu Jin
Objective To explore the feasibility of reducing radiation dose of CT colonography (CTC) while preserving image quality using the third-generation dual-source CT at 70 kV tube voltage with advanced modeled iterative reconstruction (ADMIRE). Methods This prospective study consecutively included 53 patients. All patients underwent CTC at 120 kV in supine position with filtered back projection reconstruction and at 70 kV in prone position with ADMIRE with the same scan range. Radiation dose and image quality were compared between these two protocols...
February 20, 2017: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/28256902/the-role-of-colonoscopy-and-ct-colonography-in-patients-presenting-with-symptoms-of-constipation
#14
COMPARATIVE STUDY
Kumaran Ratnasingham, Tammy Lo, Karim Jamal, Lavanya Varatharajan, Yasmin Tabbakh, Husein Kaderbhai, Nicholas J West
OBJECTIVE: There is controversy whether constipation as a primary presenting complaint is an indication for diagnostic colonoscopy. CT colonography (CTC) is a less invasive and more acceptable alternative. We compared the completion and sensitivity of colonoscopy with CTC in patients who presented with the primary symptom of constipation. METHODS: A retrospective study was conducted which examined the first 100 colonoscopies and 100 CTCs carried out for the primary symptom of constipation from June 2012 to December 2013...
May 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28130651/screening-and-surveillance-of-colorectal-cancer-using-ct-colonography
#15
REVIEW
Manoj Kumar, Brooks D Cash
Colorectal cancer (CRC) is a common cancer among throughout the world with the highest rates in developed countries such as the USA. There is ample evidence demonstrating the beneficial effects of colorectal cancer screening and, largely thanks to screening initiatives and insurance coverage, epidemiologic analyses show a steady decline in both CRC incidence and mortality rates over the last several decades. However, screening rates for CRC in the US remain low and approximately 1 in 3 adults between the ages of 50 and 75 years has not undergone any form of CRC screening, highlighting the need for additional accurate, minimally invasive, and acceptable screening options...
March 2017: Current Treatment Options in Gastroenterology
https://www.readbyqxmd.com/read/28125177/ct-colonography-in-the-detection-of-colorectal-cancer-in-ireland-economical-considerations-and-the-potential-for-centralisation-of-service-provision
#16
EDITORIAL
W Torregianni, J Power, J Feeney
No abstract text is available yet for this article.
October 12, 2016: Irish Medical Journal
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
#17
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...
May 2017: 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
#18
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...
January 1, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/27918709/spectral-photon-counting-ct-initial-experience-with-dual-contrast-agent-k-edge-colonography
#19
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...
June 2017: Radiology
https://www.readbyqxmd.com/read/27895427/irritable-bowel-syndrome-evaluation-using-computed-tomography-colonography
#20
COMPARATIVE STUDY
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
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