Establishment of shield scan method for dose reduction of mammary gland in CT screening for lung cancer

Research Project

Project/Area Number	23791384
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Radiation science
Research Institution	Hirosaki University
Principal Investigator	OSANAI Minoru 弘前大学, 保健学研究科, 助教 (40514138)
Project Period (FY)	2011 – 2013
Project Status	Completed (Fiscal Year 2013)
Budget Amount *help	¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000) Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000) Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000) Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords	CT検査 / CT肺がん検診 / 医療被ばく / 被ばく低減 / 遮蔽撮影 / ＣＴ検査 / ＣＴ肺がん検診
Research Abstract	This study aimed to clarify the material of shield that enables radiation dose reduction of mammary gland without severe degradation of image quality in CT screening for lung cancer. It distributes to the establishment of shield CT scan method. Some metal plates (copper, zinc, molybdenum and stainless) and sheets (rubber sheet and bismuth-contained sheet) were selected as a shield. The metal plates and sheets were placed over the phantom. The CT scan was performed, and radiation dose and image quality were assessed. The relationship between radiation dose reduction rate and image quality in each shield was investigated. It was suggested that shield scan method was useful, and zinc and copper is suitable for shield scan.