کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2157894 | 1090816 | 2012 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Large prostate motion produced by anal contraction Large prostate motion produced by anal contraction](/preview/png/2157894.png)
Background and purposeThe aim of this study was to define the effects of voluntary anal contraction on prostate motion in an experimental setting.Materials and methodsThirty-eight patients (median age, 76 years) with prostate cancer underwent thin-slice computed tomography (CT) in the vicinity of the prostate before and after active anal contraction. Three-dimensional displacement of the pelvis and prostate was measured.ResultsMean (±standard deviation, SD) overall displacement of the prostate due to anal contraction was 0.3 ± 1.4 mm to the right, 9.3 ± 7.8 mm to the anterior, and 5 ± 4 mm to the cranial direction. Mean displacement of the pelvis was 0.5 ± 1.8 mm to the right, 4.1 ± 7.1 mm to the anterior, and 1 ± 3 mm to the cranial direction. Mean displacement of the prostate relative to the pelvis was 0.1 ± 1.1 mm to the left, 5.2 ± 3.3 mm to the anterior, and 4 ± 4 mm to the cranial direction.ConclusionsVoluntary anal contraction within an experimental setting induces large prostate and bone motion, mainly in the anterior and cranial directions. The frequency and magnitude of actual anal contractions during radiotherapy for prostate cancer need to be determined.
Journal: Radiotherapy and Oncology - Volume 104, Issue 3, September 2012, Pages 390–394