|題名||Virtual endoscopy (1) CT, MRI b. 下部消化管の3D-CT -- CT enemaとCT colonography|
|【 要旨 】||要旨はありません。|
|Theme||Newly developed devices of colonoscope and their prospect in practice|
|Title||Clinical application of three-dimensional CT for colorectal disease|
|Author||Koichi Nagata||Digestive Disease Center, Showa University Northern Yokohama Hospital|
|Author||Shungo Endo||Digestive Disease Center, Showa University Northern Yokohama Hospital|
|Author||Kazuo Ohtsuka||Digestive Disease Center, Showa University Northern Yokohama Hospital|
|Author||Yoshiro Tamegai||Digestive Disease Center, Showa University Northern Yokohama Hospital|
|Author||Shin-ei Kudo||Digestive Disease Center, Showa University Northern Yokohama Hospital|
|[ Summary ]||Three-dimensional (3D) displays of large bowel using multidetector-row CT (MDCT) have recently become a popular clinical examination means with much improved images, owing to rapid progress in computer technology.
Since CT colonography is minimally invasive compared to colonoscopy, possibility of its clinical application for colorectal cancer screening was explored. Despite technical improvements, CT colonography is still inferior to colonoscopic examination for diagnosis of colorectal diseases, especially for flat lesions. CT colonography is not an ideal tool for colorectal cancer screening with present techniques.
CT enema demonstrates a good localization of colorectal cancer. Additionally, a grade of deformity becomes more prominent as a depth of invasion become deeper. CT enema appears to be a useful preoperative examination for laparoscopic and open surgery for colorectal cancer. Since 3D-CT is less invasive compared to barium enema, it should be the preferred method for preoperative examinations.
Progress in hardware and software for MDCT may further improve the quality of this imaging modality and its clinical applications may become broader in the near future.