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Feasibility of using ultrasound for real-time tracking during radiotherapy.

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Publication Date
2005-06
ICR Author
Bamber, Jeffrey
Evans, Philip Mark
Webb, Steve
Author
Hsu, A
Miller, NR
Evans, PM
Bamber, JC
Webb, S
Type
Journal Article
Metadata
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Abstract
This study was designed to examine the feasibility of utilizing transabdominal ultrasound for real-time monitoring of target motion during a radiotherapy fraction. A clinical Acuson 128/XP ultrasound scanner was used to image various stationary and moving phantoms while an Elekta SL25 linear accelerator radiotherapy treatment machine was operating. The ultrasound transducer was positioned to image from the outer edge of the treatment field at all times. Images were acquired to videotape and analyzed using in-house motion tracking algorithms to determine the effect of the SL25 on the quality of the displacement measurements. To determine the effect on the dosimetry of the presence of the transducer, dose distributions were examined using thermoluminescent dosimeters loaded into an Alderson Rando phantom and exposed to a 10 x 10 cm2 treatment field with and without the ultrasound transducer mounted 2.5 cm outside the field edge. The ultrasound images acquired a periodic noise that was shown to occur at the pulsing frequency of the treatment machine. Images of moving tissue were analyzed and the standard deviation on the displacement estimates within the tissue was identical with the SL25 on and off. This implies that the periodic noise did not significantly degrade the precision of the tracking algorithm (which was better than 0.01 mm). The presence of the transducer at the surface of the phantom presented only a 2.6% change to the dose distribution to the volume of the phantom. The feasibility of ultrasonic motion tracking during radiotherapy treatment is demonstrated. This presents the possibility of developing a noninvasive, real-time and low-cost method of tracking target motion during a treatment fraction.
URL
https://repository.icr.ac.uk/handle/internal/2190
Collections
  • Radiotherapy and Imaging
  • Closed Research Teams
Version of record
10.1118/1.1915934
Subject
Humans
Prostatic Neoplasms
Ultrasonography
Radiotherapy
Radiotherapy Planning, Computer-Assisted
Models, Statistical
Radiometry
Thermoluminescent Dosimetry
Phantoms, Imaging
Algorithms
Ultrasonics
Motion
Particle Accelerators
Time Factors
Image Processing, Computer-Assisted
Software
Male
Research team
Radiotherapy Physics Imaging
Radiotherapy Physics Modelling
Ultrasound & Optical Imaging
Language
eng
License start date
2005-06
Citation
Medical physics, 2005, 32 (6), pp. 1500 - 1512

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