Format

Send to

Choose Destination
Radiother Oncol. 2012 Sep;104(3):390-4. doi: 10.1016/j.radonc.2012.04.005. Epub 2012 Jun 5.

Large prostate motion produced by anal contraction.

Author information

1
University of Yamanashi, Japan. honishi@yamanashi.ac.jp

Abstract

BACKGROUND AND PURPOSE:

The aim of this study was to define the effects of voluntary anal contraction on prostate motion in an experimental setting.

MATERIALS AND METHODS:

Thirty-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.

RESULTS:

Mean (±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.

CONCLUSIONS:

Voluntary 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.

PMID:
22673728
DOI:
10.1016/j.radonc.2012.04.005
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center