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Virtual Colonography

Andrew Guinigundo
OBJECTIVE: To examine the viability of colon cancer screening with computed tomography colonography, also known as virtual colonoscopy. DATA SOURCES: Clinical guidelines, published medical research. CONCLUSION: Virtual colonoscopy, under the right circumstances, is an accurate viable screening tool for patients who may not otherwise desire to or are not able to participate in traditional colonoscopy. IMPLICATIONS FOR NURSING PRACTICE: Nurses should be aware that routine colon cancer screening is recommended starting at age 50...
March 30, 2018: Seminars in Oncology Nursing
Hannes Seuss, Rolf Janka, Matthias Hammon, Alexander Cavallaro, Michael Uder, Peter Dankerl
RATIONALE AND OBJECTIVES: To evaluate two- and three-dimensional (2D and 3D) image quality of sub-milliSievert (mSv) computed tomography (CT) colonography utilizing a third-generation dual source CT scanner featuring a tin filter. METHODS: We retrospectively evaluated 26 consecutive patients who underwent third-generation dual source CT colonography, nine with the standard-dose clinical-scan protocol (SDP) and 17 with a low-dose protocol (LDP) featuring a tin filter...
January 19, 2018: Academic Radiology
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...
December 0: Vnitr̆ní Lékar̆ství
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
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)...
March 2017: International Journal of Computer Assisted Radiology and Surgery
N Maggialetti, R Capasso, D Pinto, M Carbone, A Laporta, S Schipani, C L Piccolo, M Zappia, A Reginelli, M D'Innocenzo, L Brunese
INTRODUCTION: This study evaluated the role of computed tomography colonography (CTC) in patients who previously underwent incomplete optical colonoscopy (OC). We analyzed the impact of colonic lesions in intestinal segments not studied by OC and extracolonic findings in these patients. METHODS: Between January 2014 and May 2015, 61 patients with a history of abdominal pain and incomplete OC examination were studied by CTC. CTCs were performed by 320-row CT scan in both the supine and the prone position, without intravenous administration of contrast medium...
September 2016: International Journal of Surgery
Jin-Ya Liu, Li-Da Chen, Hua-Song Cai, Jin-Yu Liang, Ming Xu, Yang Huang, Wei Li, Shi-Ting Feng, Xiao-Yan Xie, Ming-De Lu, Wei Wang
AIM: To present our initial experience regarding the feasibility of ultrasound virtual endoscopy (USVE) and its measurement reliability for polyp detection in an in vitro study using pig intestine specimens. METHODS: Six porcine intestine specimens containing 30 synthetic polyps underwent USVE, computed tomography colonography (CTC) and optical colonoscopy (OC) for polyp detection. The polyp measurement defined as the maximum polyp diameter on two-dimensional (2D) multiplanar reformatted (MPR) planes was obtained by USVE, and the absolute measurement error was analyzed using the direct measurement as the reference standard...
March 28, 2016: World Journal of Gastroenterology: WJG
Luciano Izzo, Luca Impara, Federico Pugliese, Monir Al Mansour, Francesco De Felice, Carlo De Dominicis, Anna De Santis, Carlo De Felice, Raimondo Gabriele, Luigi Basso, Pierfrancesco Di Cello, Maria Caputo, Paolo Izzo
PURPOSE: To evaluate the clinical usefulness of preoperative computed tomography colonography (CTC) in locoregional staging in patients with abdominal pain secondary toocclusive colorectal cancer (CRC). MATERIALS AND METHODS: 80 patients with abdominal pain underwent CTC initially without contrast and after diagnosis with contrast. 47 patients had distal CRC and 33 had proximal CRC. CTimages were analyzed independently by two radiologists, using MPR reconstruction and VR images...
2015: Annali Italiani di Chirurgia
Tamaki Ichikawa, Sotaro Sadahiro, Hiroki Yuhara, Takayoshi Suzuki, Muneki Igarashi, Tetsuya Mine, Sakura Tomita, Yutaka Imai
A 29-year-old female with ulcerative colitis was found to have advanced sigmoid colon cancer on colonoscopy. Computed tomography (CT) was performed after colonoscopy for the evaluation of metastasis. CT colonography (CTC) could be understood adding carbon dioxide because of soon after colonoscopic examination. Images of CTC were evaluated by two- and three-dimensional images including virtual endoscopic, virtual colon dissection and air images, and then compared with conventional endoscopic images. Virtual endoscopic images of flat elevated cancer with shallow ulcer were similar to those findings by conventional endoscopy...
September 2015: Tokai Journal of Experimental and Clinical Medicine
Jay D Patel, Kevin J Chang
Colorectal cancer is the second leading cause of cancer-related deaths in the United States. The earlier colorectal cancer is detected, the better chance a person has of surviving 5 years after being diagnosed, emphasizing the need for effective and regular colorectal screening. Computed tomographic colonography has repeatedly demonstrated sensitivities equivalent to the current gold standard, optical colonoscopy, in the detection of clinically relevant polyps. It is an accurate, safe, affordable, available, reproducible, quick, and cost-effective option for colorectal screening and should be considered for mass screening...
March 2016: Clinical Imaging
Rie Tachibana, Janne J Näppi, Hiroyuki Yoshida
In CT colonography, orally administered positive-contrast fecal-tagging agents are used for differentiating residual fluid and feces from true lesions. However, the presence of high-density tagging agent in the colon can introduce erroneous artifacts, such as local pseudo-enhancement and beam-hardening, on the reconstructed CT images, thereby complicating reliable detection of soft-tissue lesions. In dual-energy CT colonography, such image artifacts can be reduced by the calculation of virtual monochromatic CT images, which provide more accurate quantitative attenuation measurements than conventional single-energy CT colonography...
September 2014: Abdominal Imaging: ABDI 2014
Janne J Näppi, Rie Tachibana, Daniele Regge, Hiroyuki Yoshida
In CT colonography (CTC), orally administered positive-contrast fecal-tagging agents can cause artificial elevation of the observed radiodensity of adjacent soft tissue. Such pseudo-enhancement makes it challenging to differentiate polyps and folds reliably from tagged materials, and it is also present in dual-energy CTC (DE-CTC). We developed a method that corrects for pseudo-enhancement on DE-CTC images without distorting the dual-energy information contained in the data. A pilot study was performed to evaluate the effect of the method visually and quantitatively by use of clinical non-cathartic low-dose DE-CTC data from 10 patients including 13 polyps covered partially or completely by iodine-based fecal tagging...
September 2014: Abdominal Imaging: ABDI 2014
Kunwarpal Singh, Aparna Kaur Narula, Chuni Lal Thukral, Neeti Rajan Singh, Amandeep Singh, Harmeet Kaur
BACKGROUND: Preoperative evaluation in patients with colorectal carcinoma is essential for a correct therapeutic plan. Conventional colonoscopy has certain limitations including its inability to detect synchronous lesions in case of distal obstructive mass and inaccurate tumour localization. CT colonography combines cross sectional imaging with virtual colonoscopic images and offers a comprehensive preoperative evaluation in patients with colorectal carcinoma including detection of synchronous lesions with accurate segmental localization and loco regional staging...
April 2015: Journal of Clinical and Diagnostic Research: JCDR
A Stagnitti, F Barchetti, G Barchetti, E Pasqualitto, A Sartori, M Glorioso, S Gigli, V Buonocore, M L Monti, A Marini, C Mele, F Stagnitti, A Laghi
OBJECTIVE: The aim of this study was to evaluate the clinical usefulness of computed tomography colonography (CTC) in the preoperative staging in patients with abdominal pain for occlusive colorectal cancer (CRC) and to compare the results of CTC with the surgical ones. PATIENTS AND METHODS: 127 patients with abdominal pain, iron deficiency anemia and occlusive CRC underwent a CTC examination in prone position without intravenous contrast agent and in prone position after administration of intravenous contrast medium...
2015: European Review for Medical and Pharmacological Sciences
Radin A Nasirudin, Rie Tachibana, Janne J Näppi, Kai Mei, Felix K Kopp, Ernst J Rummeny, Hiroyuki Yoshida, Peter B Noël
In recent years, dual-energy computed tomography (DECT) has been widely used in the clinical routine due to improved diagnostics capability from additional spectral information. One promising application for DECT is CT colonography (CTC) in combination with computer-aided diagnosis (CAD) for detection of lesions and polyps. While CAD has demonstrated in the past that it is able to detect small polyps, its performance is highly dependent on the quality of the input data. The presence of artifacts such as beam-hardening and noise in ultra-low-dose CTC may severely degrade detection performances of small polyps...
February 21, 2015: Proceedings of SPIE
Rie Tachibana, Janne J Näppi, Se Hyung Kim, Hiroyuki Yoshida
CT colonography (CTC) uses orally administered fecal-tagging agents to enhance retained fluid and feces that would otherwise obscure or imitate polyps on CTC images. To visualize the complete region of colon without residual materials, electronic cleansing (EC) can be used to perform virtual subtraction of the tagged materials from CTC images. However, current EC methods produce subtraction artifacts and they can fail to subtract unclearly tagged feces. We developed a novel multi-material EC (MUMA-EC) method that uses dual-energy CTC (DE-CTC) and machine-learning methods to improve the performance of EC...
March 20, 2015: Proceedings—Society of Photo-Optical Instrumentation Engineers
Ennio Biscaldi, Roberto Di Mizio, Davide Bellini, Nicola Flor, Franco Iafrate, Gabriella Jussich, Emanuele Neri, Daniele Regge, Andrea Laghi
OBJECTIVES: To produce an informed consent for CT colonography (CTC), to be diffused by the Italian Society of Radiology, aimed to make patients and referring physicians aware of CTC examination protocol, advantages and disadvantages, limits and potential related risks. MATERIALS AND METHODS: Delphi method was used to create a consensus among experts on an informed consent for CTC. The overall agreement among different consulted specialists was evaluated and ranked using the Cronbach's correlation coefficient (α) at two time points: after the first and the second 'round' of consultation...
October 2015: La Radiologia Medica
Pichamol Jirapinyo, Avlin B Imaeda, Christopher C Thompson
BACKGROUND: The Gastroenterology Core Curriculum and American Society of Gastrointestinal Endoscopy provide guidelines for endoscopic training. Program adherence to these recommendations is unclear. This study aims to assess endoscopic training experience during fellowship. METHODS: HASH(0x3f09cc8) DESIGN: Questionnaire study. SETTING: The questionnaire was circulated to US fellowship programs, with the assistance of the American Gastroenterological Association...
December 2015: Surgical Endoscopy
Srikala Narayanan, Naveen Kalra, Anmol Bhatia, Jaidev Wig, Surinder Rana, Deepak Bhasin, Kim Vaiphei, Niranjan Khandelwal
INTRODUCTION: Preoperative staging is essential for the optimal treatment and surgical planning of colorectal cancers. This study was aimed to evaluate the accuracy of colorectal cancer staging done using contrast-enhanced multidetector computed tomographic colonography (CEMDCTC). METHODS: We recruited 25 patients with 28 proven colorectal cancers. A 16-slice multidetector computed tomography scanner was used to generate two-dimensional multiplanar reformatted sagittal, coronal and oblique coronal images, and three-dimensional virtual colonography (endoluminal) images...
December 2014: Singapore Medical Journal
Rami Eliakim, Samuel N Adler
This review article deals with the clinical value of capsule endoscopy for visualization of the colon. Since its introduction in 2006, the colon capsule endoscopy underwent major technological improvements. The improved performance of colon capsule endoscopy is reviewed based on three multicenter prospective studies. Screening patients for colonic adenomatous polyps is reasonable in patients who are unwilling to undergo conventional colonoscopy. Another prospective study proved that colon capsule endoscopy is effective in incomplete colonoscopy...
March 2015: Digestive Diseases and Sciences
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