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- Title
The longitudinal effect of ejaculation on seminal vesicle fluid volume and whole-prostate ADC as measured on prostate MRI.
- Authors
Barrett, Tristan; Tanner, James; Gill, Andrew; Slough, Rhys; Wason, James; Gallagher, Ferdia; Gill, Andrew B; Slough, Rhys A; Gallagher, Ferdia A
- Abstract
<bold>Objective: </bold>To prospectively investigate the longitudinal effect of ejaculatory abstinence on MRI-measured seminal vesicle (SV) volume and whole-prostate ADC over consecutive days.<bold>Methods: </bold>15 healthy male volunteers (mean 35.9 years, range 27-53) underwent 3-T MRI at baseline and 1, 2 and 3 days post-ejaculation. Prostate and SV volumes were derived by volume segmentation and whole-gland apparent diffusion coefficient (ADC) values calculated. A mixed-effects linear regression compared ADC values and prostate/seminal vesicle volumes in each volunteer between studies in a pairwise manner.<bold>Results: </bold>All subjects completed the four MRIs. Mean prostate volume was 22.45 cm3 (range 13.04-31.21 cm3), with no change between the four studies (p = 0.89-0.99). 13/15 subjects showed SV volume reduction from baseline to day 1, with group-mean decreasing from 6.45 to 4.80 cm3 (-25.6%, p < 0.001), and a significant reduction from baseline to day 2 (-18.1%, p = 0.002). There was a significant volume increase from both day 1 (+21.3%, p = 0.006) and day 2 (+10.2%, p = 0.022) to day 3 post-ejaculation. There was a significant reduction in ADC from 1.105 at baseline to 1.056 × 10-3 mm2/s at day 1 (mean -4.3%, p = 0.009).<bold>Conclusion: </bold>The longitudinal effect of ejaculation on SV volume was demonstrated. Significant reductions in SV volume and whole-gland ADC were observed post-ejaculation, supporting a 3-day period of abstinence before prostate MRI.<bold>Key Points: </bold>• Seminal vesicle volume significantly reduced 24 h post-ejaculation remaining reduced at day 2 • Seminal vesicle fluid volume significantly increased from day 1 to day 3 post-ejaculation • There was a significant reduction in whole-gland prostate ADC values day 1 post-ejaculation • 3-day abstinence from ejaculation is required to ensure maximal seminal vesicle distension.
- Subjects
MALE ejaculation; SEMINAL vesicles; PROSTATE; MAGNETIC resonance imaging; DIFFUSION coefficients; PROSTATE physiology; SEMEN; ANTHROPOMETRY; EJACULATION; LONGITUDINAL method; MALE reproductive organs; RESEARCH funding; PHYSIOLOGY
- Publication
European Radiology, 2017, Vol 27, Issue 12, p5236
- ISSN
0938-7994
- Publication type
journal article
- DOI
10.1007/s00330-017-4905-x