Poster Presentation – Abstracts Archive

UK & Ireland Prostate Brachytherapy Conference 2017

Abstract number 17

Comparison of MR and trans-rectal US volumes obtained with and without General Anaesthetic

Shiels P*; Napier E*; Mitchell D*; Mohamed Yoosuf AB*
*Belfast City Hospital

AIMS/INTRODUCTION: In streamlining a two-step Low Dose Rate (LDR) brachytherapy service by moving from general anaesthetic to non-anaesthetic trans-rectal ultrasound prostate volume we wished to compare the volumes obtained with a pre-implant diagnostic MRI.

MATERIALS/METHODS: 50 retrospective cases were identifi ed, with 25 having PVS under general anaesthetic and 25 having non-anaesthetic PVS. Pre-implant diagnostic MRI for each case was uploaded to a brachytherapy planning system and contoured by a dedicated prostate MRI radiologist. The captured volumes were compared with the USS.

RESULTS: Across both study groups the patient ages ranged from 45 to 73, and MR calculated prostate volume sizes ranged from 19cc to 53cc. The average ratio of MRI:USS volume was 0.953 *(range 0.613-1.33) for the anaesthetic group and 0.958 *(0.539-1.342) for the non-anaesthetic cases.

CONCLUSION: Satisfactory, good quality, reproducible images can routinely be obtained from non-anaesthetic trans-rectal prostate volume study with equivalent MRI volumes when compared to anaesthetic PVSs. The data collected demonstrates that there is no statistically signifi cant difference in the MR:US ratios between the groups, supporting the ability to achieve similar quality US images without the use of anaesthetic. This reduces the risk to patients of undergoing GA and allows a greater throughput of cases and improves overall effi ciency in time.