Influence of scattered x rays on object sharpness of radiographs

Hidetaka Arimura; Takuji Date; Kaoru Morikawa; Hideaki Kubota; Masao Matsumoto; Hitoshi Kanamori

doi:10.1117/12.384526

25 April 2000 Influence of scattered x rays on object sharpness of radiographs

Hidetaka Arimura, Takuji Date, Kaoru Morikawa, Hideaki Kubota, Masao Matsumoto, Hitoshi Kanamori

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384526
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

We investigated the influence of the scattered x-rays on the object sharpness of radiographs for tube voltages of 50 to 100 kV. For the purpose, using a phantom of the polymethyl methacrylate (PMMA) with an aluminum plate of low contrast object, the edge images including the blurs due to the x-ray focal spot, the screen-film system, and the scattered x-rays were produced. However, the shape of the overall modulation transfer function (MTF) derived from the edge image is considered not to be influenced by the scattered x-rays. As a result of comparing the overall MTFs with the product of the MTFs of the x-ray focal spot and the screen-film system, we found that the scattered x-rays gave different influence on the contrast at each spatial frequency for each tube voltage. To investigate the influence of the scattered x-ray on the overall MTF in detail, considering the MTF of the x-ray focal spot, we developed a method for determining the primary and scatter components of the overall MTF, whose components are proportional to the MTFs of the screen-film system and the scattered x-rays, respectively. Using the method, it was found that (1) the overall MTF depends on the MTF of scattered x- rays as well as the MTFs of the focal spot and screen-film system; and (2) at frequencies near 0 mm^-1, the influence of the blur due to the scattered x-rays on the object sharpness was greater than that occurred in the intensifying screen and increased with the tube voltage.

Citation Download Citation

Hidetaka Arimura, Takuji Date, Kaoru Morikawa, Hideaki Kubota, Masao Matsumoto, and Hitoshi Kanamori "Influence of scattered x rays on object sharpness of radiographs", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384526

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Modulation transfer functions

X-rays

X-ray imaging

Radiography

Spatial frequencies

Signal to noise ratio

Aluminum

Show All Keywords

Keywords/Phrases

Search In:

Publication Years