|
KMID : 1151820210150030345
|
|
Journal of the Korean Society of Radiology
2021 Volume.15 No. 3 p.345 ~ p.353
|
|
|
A Study on the Scatter X-ray Signal and Noise Characteristics of Indirect Conversion-Type Detector for Radiography
|
|
Kim Jun-Woo
|
|
|
Abstract
|
|
|
|
Digital radiography imaging systems can also help diagnose lesions in patients, but if x-rays that enter the human body cause scatter x-ray due to interaction with substances, they affect the signal and noise characteristics of digital x-ray images. To regard the human body as polymethyl methacrylate (PMMA) and observe the properties of scattered x-ray generated from PMMA on x-ray images, we analyze signal and noise in the spatial domain as well as noise-power spectrum (NPS), and detective quantum efficiency (DQE) at zero frequency. As PMMA thickness increased, signals decreased, the noise increased, and NPS degradation was identified in overall spatial frequencies. Based on these characteristics, zero-frequency performance was also shown to be degraded. Comparative analysis with Monte-carlo simulations will need to be made to analyze the zero-frequency performance by scattered x-ray of indirect conversion-type x-ray detectors more quantitatively.
|
|
|
KEYWORD
|
|
|
Polymethyl methacrylate, Scatter X-ray, NPS
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|