Clinical Usefulness of Diffusion-weighted Imaging Using Low and High b-values to Detect Rectal Cancer
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概要
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Purpose: The purpose of this study was to assess the potential role of diffusion-weighted imaging (DWI) using low and high b-values to detect rectal cancer. Methods: The subjects were 15 patients diagnosed endoscopically with rectal cancer (m in 1 patient, sm in 0, mp in 3, ss in 7, se in 1, a in 3) and 20 patients diagnosed endoscopically with colon cancer and no other lesions (control group). Magnetic resonance imaging was performed using a 1.5T system. DWI was performed in the axial plane using echo planar imaging sequence (repetition time/echo time 1200/66, field of view 306×350 mm, reconstruction matrix 156×256, pixel size 2.0×1.4×8.0 mm) and acquired with 2 b-values (50 and 800 s/mm2). Low and high b-value DW images were analyzed visually. A lesion was positive by detection of a focal area of high signal in the rectum in high b-value images. The apparent diffusion coefficient (ADC) values of areas of high signal in high b-value images were calculated from the low and high b-value images. Results: High b-value images enabled visualization of all 15 rectal cancers. In the control group, 13 cases were classified as negative and 7 cases as positive for rectal cancer. Sensitivity for detection of rectal cancer was 100% (15/15), and specificity was 65% (13/20). The mean ADC values in 7 patients with false-positive lesions and in 15 patients with rectal cancer were 1.374×10-3 mm2/s (standard deviation [SD]: 0.157) and 1.194×10-3 mm2/s (SD: 0.152), respectively (P=0.026). Conclusion: DWI with low and high b-values may be used to screen for rectal cancer.
- 日本磁気共鳴医学会の論文
- 2006-12-31
著者
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YANAGA Katsuhiko
Department of Transplantation and Digestive Surgery, Nagasaki University Graduate School of Biomedic
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Fukuda Kunihiko
Department of Radiology, Jikei University School of Medicine
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Sakuma Tohru
Department of Radiology, Jikei University School of Medicine, Medical Center
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TOZAKI Mitsuhiro
Department of Radiology, The Jikei University School of Medicine
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Yanaga Katsuhiko
Department Of Surgery Aoto Hospital Jikei University School Of Medicine
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ICHIBA Noriatsu
Departments of Oncoradiology and Radiology, Nara Medical University
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Sakuma Tohru
Department Of Radiology Jikei University School Of Medicine
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Ichiba Noriatsu
Department Of Radiology Jikei University School Of Medicine
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Fukuda Kunihiko
Department Of Radiology Jikei University School Of Medicine
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Fukuda Kunihiko
Department Of Radiology And Dentistry Jikei University School Of Medicine
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HOSONUMA Tomonori
Department of Surgery, Jikei University School of Medicine
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HAYASHI Daichi
Department of Radiology, Jikei University School of Medicine
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Hayashi Daichi
Department Of Radiology Jikei University School Of Medicine
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Hosonuma Tomonori
Department Of Surgery Jikei University School Of Medicine
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Tozaki Mitsuhiro
Department Of Radiology The Jikei University School Of Medicine
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Tozaki Mitsuhiro
Department Of Radiology And Dentistry Jikei University School Of Medicine
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Tozaki Mitsuhiro
Department Of Radiology Jikei University School Of Medicine
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