MRI Temperature Mapping of the Prostate and Urogenital Pelvis Cooled by an Endorectal Balloon
|ClinicalTrials.gov Identifier: NCT01979848|
Recruitment Status : Completed
First Posted : November 8, 2013
Last Update Posted : December 13, 2016
Urinary incontinence and sexual dysfunction are potential side effects for men undergoing the successful removal of the cancerous prostate via surgery. Hypothermic cooling via the investigational Endorectal Cooling Balloon has been shown by our group to significantly reduce long term urinary incontinence and may reduce sexual dysfunction in men after robotic prostatectomy, and improve the patient's long term quality of life (QOL). However before successful translation of the endorectal balloon can proceed into the world wide usage, we must understand:
- How effectively the tissues for continence and sexual function are cooled within the pelvis.
- What is the capacity of vascularized structures (i.e. the neurovascular bundle) to 'cool sink' or diminish the effective cooling and
- Determine if the endorectal balloon can be re‐designed for improved QOL outcomes in men.
This research study marries two new techniques of Thermal MRI imaging and Endorectal cooling for prostate cancer surgery. MRI is non‐invasive. A simple confirmation of effective hypothermic cooling can be achieved by novel MRI thermal mapping of the cooling gradient as it comprehensively sweeps through the rectum across the urogenital pelvis. MRI with temperature adaptive software can accurately map these gradients with non‐invasive technique, and answer formidable questions of the effectiveness of hypothermic cooling of the prostate and its direct translation into improved continence and sexual function after surgery. The purpose of this research study is to use Magnetic Resonance Imaging (MRI) and Thermal MRI with subjects who will receive the investigational endorectal cooling balloon to help further understand how the cooling balloon works, which may translate to other uses in the future, including the diagnosis of patients at a high risk of developing prostate cancer.
|Condition or disease|
|Prostate Cancer Hypothermia Urinary Incontinence Erectile Dysfunction|
|Study Type :||Observational|
|Actual Enrollment :||3 participants|
|Official Title:||MRI (Magnetic Resonance Imaging) Temperature Mapping of the Prostate and Urogenital Pelvis Cooled by an Endorectal Balloon|
|Study Start Date :||June 2013|
|Actual Primary Completion Date :||November 2015|
|Actual Study Completion Date :||November 2015|
MRI Mapping Group
After Subjects arrive at the MRI facility, subjects will fill out a medical questionnaire that will be used to determine whether a MRI study can be performed. The investigators will determine whether there are any problems that make the subject not suitable for participating in this study.
- Describe cooling based on MRI thermal mapping in terms a) change in temperature over time at 5 locations and by b) thermal map of tissue volume at various time points [ Time Frame: One session MRI thermal mapping ]During pre and post hypothermia, initial temperatures will be measured simultaneously on five 3‐mm‐thick image slices that covered the target. The thermometry scan can be repeated every 6 s. Tissue temperature map is measured by magnetic resonance thermometry (echo planar imaging with multiphase; field of view: 25 × 25 cm; matrix 256 × 256; number of excitations: 1; repetition time: 545 ms; echo time: 20 ms; flip angle: 20°; slice thickness: 3 mm); (b) a thermal map of the tissue volume will be superimposed on the anatomical image.
- Describe associations between temperature (at 5 locations) and time to continence. [ Time Frame: 30 days and 60 days after Robotic surgery ]Before the subject's scheduled radical prostatectomy surgery, they will have an MRI combined with an cooling endorectal balloon (this study), which will 1. Show the dimensions of their lower pelvis, including the prostate, and 2.Measure how cold the tissue around the prostate becomes using the cooling balloon. The thermal MRI images will allow elucidation of temperatures at specified anatomic locations and their changes over time. Data will be described using means for normally distributed continuous variables. We will test for associations between temperature and continence using t‐tests to compare temperature change between those who achieve continence at 30 and 60 days and those who do not.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01979848
|United States, California|
|University of California, Irvine Medical Center|
|Orange, California, United States, 92868|
|Principal Investigator:||Thomas E Ahlering, MD||University of California, Irvine|