keyword
MENU ▼
Read by QxMD icon Read
search

CT Colonography

keyword
https://www.readbyqxmd.com/read/27918709/spectral-photon-counting-ct-initial-experience-with-dual-contrast-agent-k-edge-colonography
#1
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
#2
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
#3
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
#4
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/27864601/predictors-of-primary-care-provider-adoption-of-ct-colonography-for-colorectal-cancer-screening
#5
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
#6
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
#7
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
#8
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
#9
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...
October 25, 2016: 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
#10
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/27649702/colorectal-cancer-screening-patient-education-materials-how-effective-is-online-health-information
#11
Elizabeth Sheena John, Ann M John, David R Hansberry, Prashant J Thomas, Prateek Agarwal, Christopher Deitch, Sita Chokhavatia
PURPOSE: Patients screened for colorectal cancer (CRC) frequently turn to the Internet to improve their understanding of tests used for detection, including colonoscopy, flexible sigmoidoscopy, fecal occult blood test (FOBT), and CT colonography. It was of interest to determine the quality and readability levels of online health information. METHODS: The screening tools were googled, and the top 20 results of each test were analyzed for readability, accessibility, usability, and reliability...
September 20, 2016: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/27609830/subclonal-diversity-arises-early-even-in-small-colorectal-tumours-and-contributes-to-differential-growth-fates
#12
Chelsie K Sievers, Luli S Zou, Perry J Pickhardt, Kristina A Matkowskyj, Dawn M Albrecht, Linda Clipson, Jeffery W Bacher, B Dustin Pooler, Fouad J Moawad, Brooks D Cash, Mark Reichelderfer, Tien N Vo, Michael A Newton, Bret R Larget, Richard B Halberg
OBJECTIVE AND DESIGN: The goal of the study was to determine whether the mutational profile of early colorectal polyps correlated with growth behaviour. The growth of small polyps (6-9 mm) that were first identified during routine screening of patients was monitored over time by interval imaging with CT colonography. Mutations in these lesions with known growth rates were identified by targeted next-generation sequencing. The timing of mutational events was estimated using computer modelling and statistical inference considering several parameters including allele frequency and fitness...
September 8, 2016: Gut
https://www.readbyqxmd.com/read/27580426/diagnostic-performance-and-patient-acceptance-of-reduced-laxative-ct-colonography-for-the-detection-of-polypoid-and-non-polypoid-neoplasms-a-multicenter-prospective-trial
#13
Kenichi Utano, Koichi Nagata, Tetsuro Honda, Toru Mitsushima, Takaaki Yasuda, Takashi Kato, Shoichi Horita, Michio Asano, Noritaka Oda, Kenichiro Majima, Yasutaka Kawamura, Michiaki Hirayama, Naoki Watanabe, Hidenori Kanazawa, Alan Kawarai Lefor, Hideharu Sugimoto
Purpose To evaluate the diagnostic accuracy and patient acceptance of reduced-laxative computed tomographic (CT) colonography without computer-aided detection (CAD) for the detection of colorectal polypoid and non-polypoid neoplasms in a population with a positive recent fecal immunochemical test (FIT). Materials and Methods Institutional review board approval and written informed consent were obtained. This multicenter prospective trial enrolled patients who had positive FIT results. Reduced-laxative CT colonography and colonoscopy were performed on the same day...
August 31, 2016: Radiology
https://www.readbyqxmd.com/read/27552558/colorectal-findings-at-repeat-ct-colonography-screening-after-initial-ct-colonography-screening-negative-for-polyps-larger-than-5-mm
#14
Perry J Pickhardt, B Dustin Pooler, Ifeanyi Mbah, Jennifer M Weiss, David H Kim
Purpose To determine the rate and types of polyps detected at repeat computed tomographic (CT) colonography screening after initial negative findings at CT colonography screening. Materials and Methods Among 5640 negative CT colonography screenings (no polyps ≥ 6 mm) performed before 2010 at one medical center, 1429 (25.3%; mean age, 61.4 years; 736 women, 693 men) patients have returned for repeat CT colonography screening (mean interval, 5.7 years ± 0.9; range, 4.5-10.7 years). Positive rates and histologic findings of initial and repeat screening were compared in this HIPAA-compliant, institutional review board-approved study...
August 22, 2016: Radiology
https://www.readbyqxmd.com/read/27542076/ct-colonography-for-population-screening-of-colorectal-cancer-hints-from-european-trials
#15
Lapo Sali, Daniele Regge
CT colonography (CTC) is a minimally invasive radiological investigation of the colon. Robust evidence indicates that CTC is safe, well tolerated and highly accurate for the detection of colorectal cancer (CRC) and large polyps, which are the targets of screening. Randomized controlled trials were carried out in Europe to evaluate CTC as the primary test for population screening of CRC in comparison with faecal immunochemical test (FIT), sigmoidoscopy and colonoscopy. Main outcomes were participation rate and detection rate...
December 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27533599/lumbar-transforaminal-epidural-steroid-injections-incidental-extraspinal-findings-on-planning-imaging
#16
Gerritt M Lagemann, Patrick W Aldred, Amir A Borhani, Anish Ghodadra, Vikas Agarwal
OBJECTIVE: Planning imaging performed during CT-guided procedures may occasionally contain important incidental findings. The purpose of this study was to identify and characterize by clinical relevance the extraspinal findings detected on planning imaging for CT-guided lumbar transforaminal epidural steroid injections (TFESIs). MATERIALS AND METHODS: Four radiologists retrospectively evaluated the planning scout views and CT studies for 488 consecutive CT-guided lumbar TFESIs performed in 400 patients over a 1-year period...
December 2016: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/27505184/indeterminate-but-likely-unimportant-extracolonic-findings-at-screening-ct-colonography-c-rads-category-e3-incidence-and-outcomes-data-from-a-clinical-screening-program
#17
B Dustin Pooler, David H Kim, Perry J Pickhardt
OBJECTIVE: The purpose of this study was to analyze the incidence and outcomes of unsuspected indeterminate but likely unimportant extracolonic findings (CT Colonography Reporting and Data System [C-RADS] category E3) at screening CT colonography (CTC). MATERIALS AND METHODS: Over 99 months (April 2004 through June 2012), 7952 consecutive adults without symptoms of colorectal cancer (4277 women, 3675 men; mean age ± SD, 56.7 ± 7.3 years) underwent first-time screening CTC...
November 2016: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/27490941/diagnostic-accuracy-of-ct-for-local-staging-of-colon-cancer-a-systematic-review-and-meta-analysis
#18
Elias Nerad, Max J Lahaye, Monique Maas, Patty Nelemans, Frans C H Bakers, Geerard L Beets, Regina G H Beets-Tan
OBJECTIVE: The purpose of this article is to determine the accuracy of CT in the detection of tumor invasion beyond the bowel wall and nodal involvement of colon carcinomas. A literature search was performed to identify studies describing the accuracy of CT in the staging of colon carcinomas. Studies including rectal carcinomas that were inseparable from colon carcinomas were excluded. Publication bias was explored by using a Deeks funnel plot asymmetry test. A hierarchic summary ROC model was used to construct a summary ROC curve and to calculate summary estimates of sensitivity, specificity, and diagnostic odds ratios (ORs)...
November 2016: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/27443490/risk-of-cancer-in-small-and-diminutive-colorectal-polyps
#19
Prasanna L Ponugoti, Oscar W Cummings, Douglas K Rex
The prevalence of cancer in small and diminutive polyps is relevant to "resect and discard" and CT colonography reporting recommendations. We evaluated a prospectively collected colonoscopy polyp database to identify polyps <10mm and those with cancer or advanced histology (high-grade dysplasia or villous elements). Of 32,790 colonoscopies, 15,558 colonoscopies detected 42,630 polyps <10mm in size. A total of 4790 lesions were excluded as they were not conventional adenomas or serrated class lesions. There were 23,524 conventional adenomas <10mm of which 22,952 were tubular adenomas...
June 28, 2016: Digestive and Liver Disease
https://www.readbyqxmd.com/read/27431209/robust-colonoscope-tracking-method-for-colon-deformations-utilizing-coarse-to-fine-correspondence-findings
#20
Masahiro Oda, Hiroaki Kondo, Takayuki Kitasaka, Kazuhiro Furukawa, Ryoji Miyahara, Yoshiki Hirooka, Hidemi Goto, Nassir Navab, Kensaku Mori
PURPOSE: Polyps found during CT colonography can be removed by colonoscopic polypectomy. A colonoscope navigation system that navigates a physician to polyp positions while performing the colonoscopic polypectomy is required. Colonoscope tracking methods are essential for implementing colonoscope navigation systems. Previous colonoscope tracking methods have failed when the colon deforms during colonoscope insertions. This paper proposes a colonoscope tracking method that is robust against colon deformations...
July 18, 2016: International Journal of Computer Assisted Radiology and Surgery
keyword
keyword
99521
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"