Background: The majority of Ontario cancer centres incorporate bladder and bowel preparation protocols for the treatment of prostate cancer with radical radiotherapy. Differing methods are used to achieve a full bladder and empty rectum for planning and treatment. We compared the effects of two different bladder and bowel preparation regimens on bladder, rectum, and prostate þ/À seminal vesicle geometries through a course of radiotherapy. An optimal preparation would achieve reliable spatial arrangements and a high therapeutic ratio.Journal de l'imagerie médicale et des sciences de la radiation www.elsevier.com/locate/jmir Conclusions : Aucune diff erence significative n'a et e not ee entre les deux cohortes pour le volume rectal, le volume de gaz, la couverture de cible et le volume du rectum et de la vessie dans le volume cible de planification. Par cons equent, les patients devraient avoir le choix entre les r egimes de pr eparation des intestins des deux cohortes afin de tenir compte des pr ef erences des patients. En ce qui concerne la pr eparation de la vessie, le r egime de pr eparation de la cohorte 2 s'est av er e sup erieur en termes d'uniformit e, avec un volume l eg erement sup erieur au fil du temps.
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