A SYSTEMATIC STUDY ON FACTORS AFFECTING PATIENT DOSE : 2nd Report : On FFD, Patient Thickness and Grid

OTSUKA AKIYOSHI, HIGASHIDA YOSHIHARU, UTSUMI HIROMOTO, OTA MASAJI, NAKANISHI TAKASHI, YOKOYAMA TAKASHI, FUKUYAMA MASARU

doi:10.6009/jjrt.kj00003104995

A SYSTEMATIC STUDY ON FACTORS AFFECTING PATIENT DOSE : 2nd Report : On FFD, Patient Thickness and Grid

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OTSUKA AKIYOSHI

Department of Radiology, Yamaguchi University Hospital
HIGASHIDA YOSHIHARU

Department of Radiology, Yamaguchi University Hospital:(Present address)Presently at College of Medical Technology and Nursing, Kumamoto University
UTSUMI HIROMOTO

Department of Radiology, Yamaguchi University Hospital
OTA MASAJI

Department of Radiology, Yamaguchi University Hospital:(Present address)Presently at Fukuoka Higashi Byoin, National Sanatorium
NAKANISHI TAKASHI

Department of Radiology, Yamaguchi University Hospital
YOKOYAMA TAKASHI

Department of Radiology, Yamaguchi University Hospital
FUKUYAMA MASARU

Department of Radiology, Yamaguchi University Hospital:(Present address)Presently at Tokuyama Central Hospital

Bibliographic Information

Other Title

患者被曝線量を左右する因子の系統的研究 : 第2報 FFDと被写体の厚さならびにグリッドについて
患者被曝線量を左右する因子の系統的研究-2-FFDと被写体の厚さならびにグリッドについて
カンジャヒバクセンリョウオサユウスルインシノケイトウテキケンキ

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Abstract

In the preceding report, we dealt with the field size and the tube voltage. This paper covers the differences in patient dose due to the focus to film distance (FFD), the patient thickness and whether the grid is used or not. Regarding the FFD, 100 cm is most commonly employed except in X-ray examinations of the chest, but from the viewpoint of the patient dose, this requires special consideration as to whether there is any theoretical basis for it. The patient thickness has a great bearing on the patient dose, but there is an individual difference, and it is almost impossible to change it artificially. However, there has been no detailed report on the relation between the patient thickness and the patient dose, therefore, this report treats of such relationship as well. Concerning the grid, consideration is given to the exposure times (Bucky factor).

Journal

Japanese Journal of Radiological Technology

Japanese Journal of Radiological Technology 35 (2), 158-167, 1979

Japanese Society of Radiological Technology