|
KMID : 1038720160270020055
|
|
Progress in Medical Physics
2016 Volume.27 No. 2 p.55 ~ p.63
|
|
|
Modulation Transfer Function with Aluminum Sheets of Varying Thickness
|
|
Rhee Dong-Joo
Kim Me-Young
Moon Young-Min
Jeong Dong-Hyeok
|
|
|
Abstract
|
|
|
|
We studied the method to gain a clear LSF using a thick aluminum sheet and to acquire the spatial resolution value with a high accuracy for a low spatial resolution imaging modality. In this study, aluminum sheets with thicknesses varying from 0.3 mm to 1.2 mm were tested to derive a modulation transfer function (MTF) for the oversampling and non-oversampling methods. The results were evaluated to verify the feasibility of the use of thick sheets for periodic quality assurance. Oversampling was more accurate than non-oversampling, and an aluminum sheet with a correction factor less than 2 at the cut-off frequency, which was less than 0.8 mm in this case, was confirmed to be suitable for MTF measurements. Therefore, MTF derivation from a thick aluminum sheet with thickness correction is plausible for a medical imaging modality.
|
|
|
KEYWORD
|
|
|
Modulation transfer functions, Image spatial resolution, Oversampling method
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
 
|