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ID 11755
JaLCDOI
Sort Key
4
Title Alternative
New Stepwedge for Bootstrap Sensitometry in Medical Radiography
FullText URL
Author
Yoshida, Akira
Kobashi, Toshimi
Ohkawa, Yoshihiro
Mikami, Yasutaka
Hiraki, Yoshio
Yamada, Toshiharu
Sugita, Katsuhiko
Abstract
A new stepwedge has been developed for bootstrap sensitometry, which is used for determining the characteristic curve of radiographic screen/film systems. Since each step of the stepwedge is separated by the lead septum, flare generated under one step will not penetrate the region of another step. The metal of the stepwedge can be changed with various materials. Characteristic curves obtained with new stepwedge bootstrap (NSB) and conventional stepwedge bootstrap (CSB) techniques were compared with those obtained for screen/film systems with inverse sqare sensitometry. The inverse square method was used as the reference standard for accuracy. The NSB method provided characteristic curves that agreed well with those obtained using the inverse square method. The slope of the curve in the CSB method was lower than that in the inverse square or NBS method, because of scatter radiation. The shape of the characteristic curve from the NSB method did not vary with the materials of step metals (aluminum and copper). The cumulative error involved when using the bootstrap method is also discussed.
Keywords
Stepwedge
Bootstrap
Characteristic curves
Sensitometry
Radiographic screen/film systems
Publication Title
岡山大学医療技術短期大学部紀要
Published Date
1991-03-25
Volume
volume1
Publisher
岡山大学医療技術短期大学部
Publisher Alternative
School of Health Sciences Okayama University
Start Page
19
End Page
27
ISSN
0917-4494
NCID
AN10355371
Content Type
Departmental Bulletin Paper
OAI-PMH Set
岡山大学
language
日本語
File Version
publisher
NAID
Eprints Journal Name
fhs