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Original Article

Korean Journal of Medical Physics 2013; 24(1): 76-83

Published online March 25, 2013

Copyright © Korean Society of Medical Physics.

Development of Artificial Pulmonary Nodule for Evaluation of Motion on Diagnostic Imaging and Radiotherapy

움직임 기반 진단 및 치료 평가를 위한 인공폐결절 개발

Sang Keun Woo*, Noh Won Park, Seung Woo Park, Jung Woo Yu*, Su Chul Han, Seung Jun Lee, Kyeong Min Kim*, Joo Hyun Kang*, Young Hoon Ji, Ki Dong Eom

우상근*ㆍ박노운ㆍ박승우ㆍ유정우*ㆍ한수철ㆍ이승준ㆍ김경민*ㆍ강주현*ㆍ지영훈ㆍ엄기동

*Molecular Imaging Research Center, Division of Radiation Cancer Research, Korea Institute of Radiological and Medical Sciences, Department of Veterinary Radiology and Diagnostic Imaging, College of Veterinary Medicine, Konkuk University, Seoul, Korea

한국원자력의학원 방사선의학연구소 *분자영상연구부, 방사선암연구부, 건국대학교 수의과대학 수의방사선 및 영상진단의학교실

Abstract

Previous studies about effect of respiratory motion on diagnostic imaging and radiation therapy have been performed by monitoring external motions but these can not reflect internal organ motion well. The aim of this study was to develope the artificial pulmonary nodule able to perform non-invasive implantation to dogs in the thorax and to evaluate applicability of the model to respiratory motion studies on PET image acquisition and radiation delivery by phantom studies. Artificial pulmonary nodule was developed on the basis of 8 Fr disposable gastric feeding tube. Four anesthetized dogs underwent implantation of the models via trachea and implanted locations of the models were confirmed by fluoroscopic images. Artificial pulmonary nodule models for PET injected 18F-FDG and mounted on the respiratory motion phantom. PET images of those acquired under static, 10-rpm- and 15-rpm-longitudinal round motion status. Artificial pulmonary nodule models for radiation delivery inserted glass dosemeter and mounted on the respiratory motion phantom. Radiation delivery was performed at 1 Gy under static, 10-rpm- and 15-rpm-longitudinal round motion status. Fluoroscpic images showed that all models implanted in the proximal caudal bronchiole and location of models changed as respiratory cycle. Artificial pulmonary nodule model showed motion artifact as respiratory motion on PET images. SNR of respiratory gated images was 7.21. which was decreased when compared with that of reference images 10.15. However, counts of respiratory images on profiles showed similar pattern with those of reference images when compared with those of static images, and it is assured that reconstruction of images using by respiratory gating improved image quality. Delivery dose to glass dosemeter inserted in the models were same under static and 10-rpm-longitudinal motion status with 0.91 Gy, but dose delivered under 15-rpm-longitudinal motion status was decreased with 0.90 Gy. Mild decrease of delivered radiation dose confirmed by electrometer. The model implanted in the proximal caudal bronchiole with high feasibility and reflected pulmonary internal motion on fluoroscopic images. Motion artifact could show on PET images and respiratory motion resulted in mild blurring during radiation delivery. So, the artificial pulmonary nodule model will be useful tools for study about evaluation of motion on diagnostic imaging and radiation therapy using laboratory animals.

KeywordsMotion, Artificial pulmonary nodule model, PET, Radiation delivery

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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