NCT02722616

Ultrasound Monitoring of Abdominal Soft Tissue

Ultrasound System For Non-Invasive, Real-Time Monitoring of Abdominal Soft Tissue

• Status: Terminated
• Phase: N/A
• Study type: Interventional
• Enrollment: 2 (actual)
• Sponsor: Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins · Academic / Other
• Sex: All
• Age: 18 Years – 100 Years
• Healthy volunteers: Accepted

Summary

This research study is being done to collect data and analyze the motion of soft tissue in the abdomen (liver, pancreas, stomach and intestines) of people who have pancreatic and liver cancer as well as healthy volunteers. During the study researchers will look at the movement of organs in the abdomen that naturally occurs with breathing and with a bowel movement. This study will examine the differences between abdominal soft tissue motion in healthy volunteers and in cancer patients with the goal of developing a better way to manage and minimize the abdominal soft tissue motion. Accurate location of the tumor is very important in treatment delivery and reduction of toxicity.

Detailed description

Within the last decade, Linac based stereotactic body radiation therapy (SBRT) has been shown to be an effective treatment option for pancreas1, 2 and liver3, 4 tumors. SBRT delivers high doses of radiation therapy to the tumor over only 1-5 treatments. Because of the spatial precision of SBRT, it is feasible to administer a high radiation dose in only a few treatments. By minimizing the amount of radiation to surrounding healthy tissue, it is possible to decrease the rate of toxicity/complication and increase the radiation dose to cancerous tissue, thereby allowing better local control. SBRT of the abdomen has been limited by the movement of intra-abdominal organs that naturally occurs with respiration and bowel movement. Organ motion occurs both intra- and inter-fractionally. While intra-fractional motion is a result of respiration, peristalsis and cardiac motion, the magnitude of inter-fractional target motion is dependent of daily variations in organ filling, weight change, tumor growth and radiation induced changes of tissue. Tumor movement may lead to tumor displacement and suboptimal dose delivery. Accurate localization of the target is very important to improve treatment delivery accuracy and reduce toxicity of the treatment. To evaluate tumor motion due to breathing motion, a four dimensional (4D) CT simulation scan is performed. If the tumor moves more than 3 mm during a breathing cycle, breathing motion management is employed using Active Breathing Control (ABC) technique. ABC requires the patient to hold his/her breath within the proper tidal volume while treatment is delivered, while free breathing may be resumed between periods of treatment. This technique limits the delivery of RT to specific phases of the respiratory cycle so as to minimize the influence of breathing on the delineated tumor. Despite significant progress made in ABC technique, tumor and organ motion could only be minimized and not eliminated completely with this technique. Assessing patient specific tumor/organ motion (both intra- and interfractional) throughout the course of SBRT treatment offers the possibility of ensuring delivery of the prescribed target dose while simultaneously minimizing normal tissue damage. In order to monitor the abdominal soft tissue motion, the Department of Radiation Oncology has developed a 4D ultrasound technique based on an ultrasound probe holder and a continuous motion monitoring software. The 4D ultrasound image is acquired by using a motorized 3D ultrasound probe and image continuously. 4D ultrasound is a new non-ionizing and non-invasive imaging technique that continuously monitors the tumor motion during the radiation treatment in real time.

Conditions

• Pancreatic Cancer
• Liver Cancer

Interventions

Type	Name	Description
DEVICE	Ultrasound scan of the pancreas	A 4D ultrasound scan will be acquired at the time at simulation and used as a reference ultrasound image for localizing tracking target. The ultrasound probe will be placed at the abdominal area to monitor the pancreas motion. The probe will remain in place during the CT scan. Patient setup and the ultrasound probe location will be recorded so that the same setup can be reproduced during treatment delivery.
DEVICE	Ultrasound scan of the Liver	A 4D ultrasound scan will be acquired at the time at simulation and used as a reference ultrasound image for localizing tracking target. The ultrasound probe will be placed at the abdominal area to monitor the liver motion. The probe will remain in place during the CT scan. Patient setup and the ultrasound probe location will be recorded so that the same setup could be reproduced during treatment delivery. The ultrasound probe in the CT image will be contoured and radiation beams that directly pass through the ultrasound probe will be avoided.
DRUG	Reference ultrasound	A reference ultrasound scan will be conducted on each subject during breath-hold. Subjects will be required to lie in supine position and engaged with ABC; an ultrasound probe will be placed at the abdomen area with minimal pressure applied. Continuous motion monitoring is achieved by acquiring 4D ultrasound images using a motorized 3D ultrasound probe to image the pancreas, liver and other intra-abdominal organs continuously. Several 4D ultrasound scans will be collected during subsequent breath-holds that serve as secondary images.

Timeline

• Start date: 2016-05-01
• Primary completion: 2022-10-28
• Completion: 2022-10-28
• First posted: 2016-03-30
• Last updated: 2024-01-18
• Results posted: 2024-01-18

Locations

1 site across 1 country: United States