A NOVEL, REMOVABLE, CERROBEND, BEAM-BLOCKING DEVICE FOR RADIATION THERAPY OF THE CANINE HEAD AND NECK: PILOT STUDY.

Autor: Kent MS; Departments of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, 95616., Berlato D; the Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk, CB8 7UU, UK., Vanhaezebrouck I; The William R. Pritchard Veterinary Medical Teaching Hospital, University of California, Davis, CA, 95616., Gordon IK; Departments of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, 95616., Hansen KS; Departments of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, 95616., Theon AP; Departments of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, 95616., Holt RW; School of Veterinary Medicine, University of California, Davis, CA, 95616.; Pacific Crest Medical Physics Inc, Chico, CA, 95973., Trestrail EA; School of Veterinary Medicine, University of California, Davis, CA, 95616.; Pacific Crest Medical Physics Inc, Chico, CA, 95973.
Jazyk: angličtina
Zdroj: Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association [Vet Radiol Ultrasound] 2017 Jan; Vol. 58 (1), pp. 100-105. Date of Electronic Publication: 2016 Oct 17.
DOI: 10.1111/vru.12437
Abstrakt: Radiation therapy of the head and neck can result in mucositis and other acute affects in the oral cavity. This prospective pilot study evaluated a novel, intraoral, beam-blocking device for use during imaging and therapeutic procedures. The beam-blocking device was made from a metal alloy inserted into a coated frozen dessert mold (Popsicle® Mold, Cost Plus World Market, Oakland, CA). The device was designed so that it could be inserted into an outer shell, which in turn allowed it to be placed or removed depending on the need due to beam configuration. A Farmer type ionization chamber and virtual water phantom were used to assess effects of field size on transmission. Six large breed cadaver dogs, donated by the owner after death, were recruited for the study. Delivered dose at the dorsal and ventral surfaces of the device, with and without the alloy block in place, were measured using radiochromic film. It was determined that transmission was field size dependent with larger field sizes leading to decreased attenuation of the beam, likely secondary to scatter. The mean and median transmission on the ventral surface without the beam-blocking device was 0.94 [range 0.94-0.96]. The mean and median transmission with the beam-blocking device was 0.52 [range 0.50-0.57]. The mean and median increase in dose due to backscatter on the dorsal surface of the beam-blocking device was 0.04 [range 0.02-0.04]. Findings indicated that this novel device can help attenuate radiation dose ventral to the block in dogs, with minimal backscatter.
(© 2016 American College of Veterinary Radiology.)
Databáze: MEDLINE
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