In Vivo Dosimetry During Prostate Cancer Radiotherapy

This study is currently recruiting participants. (see Contacts and Locations)
Verified October 2014 by M.D. Anderson Cancer Center
Information provided by (Responsible Party):
M.D. Anderson Cancer Center Identifier:
First received: March 1, 2011
Last updated: October 22, 2014
Last verified: October 2014

The goal of this clinical research study is to learn if a rectal balloon with attached radiation detectors can be used to help researchers monitor the dose of external beam radiation that is delivered to the prostate during treatment. This may help researchers better understand the side effects of radiation therapy, such as rectal bleeding, and may lead to changes in treatment planning or treatment delivery.

Condition Intervention Phase
Prostate Disease
Device: Plastic Scintillation Detectors
Phase 1

Study Type: Interventional
Study Design: Endpoint Classification: Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Pilot Study to Evaluate In Vivo Plastic Scintillation Detectors for Real-Time Radiation Dosimetry During Prostate Cancer Radiotherapy

Further study details as provided by M.D. Anderson Cancer Center:

Primary Outcome Measures:
  • Measurement of True In Vivo Radiation to Rectal Wall During Prostate Radiotherapy [ Time Frame: Twice a week for 7 week treatment. ] [ Designated as safety issue: No ]
    Twice a week in vivo measurements of radiation dose absorbed by the rectal wall during intensity-modulated radiotherapy (IMRT) of prostate.

Estimated Enrollment: 15
Study Start Date: November 2011
Estimated Primary Completion Date: April 2016 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: In Vivo Dosimetry
Modified endorectal device capable of real-time dose measurement during prostate radiation therapy
Device: Plastic Scintillation Detectors
Radiation detectors attached to rectal balloon for each CT scan done during each radiation treatment. Treatment delivery Monday through Friday for 7 weeks.

Detailed Description:

As a part of your standard of care, you will have external beam radiation therapy. You will have a computerized tomography (CT) scan of the pelvis before the external beam radiation therapy.

For the CT scan, you will be given an enema to empty your bowel, and you will drink about 16 to 24 ounces of water to fill your bladder

A rectal balloon will then be inserted into your rectum and filled with either air or water. You will then have the CT scan. The CT scan should take about 45 minutes.

If you agree to take part in this study, very thin (millimeter-sized) radiation detectors will be attached to the rectal balloon during each of two CT scans per week you will have while you are receiving radiation. You may have additional CT scans (without the detector) each week if your doctor thinks it is needed.

The doses read by the radiation detectors will be compared to the doses that you were originally scheduled to receive after each radiation treatment and at the end of the study.

You will be off study after your final radiation treatment using the rectal balloon.

This is an investigational study. Up to 15 patients will take part in this study. All will be enrolled at MD Anderson.


Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Any patients with prostate cancer who are undergoing routine radiation therapy for their prostate cancer, including post-prostatectomy patients.
  2. The selection criteria will be limited to the patient's ability to withstand insertion of a rectal balloon and his willingness to participate in the study.
  3. We will choose patients undergoing photon and proton treatments.

Exclusion Criteria:


  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01307852

Contact: Sam Beddar, PHD 713-563-2300

United States, Texas
University of Texas MD Anderson Cancer Center Recruiting
Houston, Texas, United States, 77030
Principal Investigator: Sam Beddar, PHD         
Sponsors and Collaborators
M.D. Anderson Cancer Center
Principal Investigator: Sam Beddar, PHD M.D. Anderson Cancer Center
  More Information

Additional Information:
No publications provided

Responsible Party: M.D. Anderson Cancer Center Identifier: NCT01307852     History of Changes
Other Study ID Numbers: 2010-0427, NCI-2011-00863
Study First Received: March 1, 2011
Last Updated: October 22, 2014
Health Authority: United States: Institutional Review Board

Keywords provided by M.D. Anderson Cancer Center:
Fiber optic radiation detectors
Enhanced endorectal balloon
Radiation treatment
External beam radiation
Dosimetry processed this record on March 30, 2015