Comparison of clinical and physical measures of image quality in chest and pelvis computed radiography at different tube voltages
Sandborg, Michael ; Tingberg, Anders LU
; Ullman, Gustaf
; Dance, David R.
and Carlsson, Gudrun Alm
(2006)
In Medical Physics
33(11).
p.4169-4175
- Abstract
- The aim of this work was to study the dependence of image quality in digital chest and pelvis radiography on tube voltage, and to explore correlations between clinical and physical measures of image quality. The effect on image quality of tube voltage in these two examinations was assessed using two methods. The first method relies on radiologists' observations of images of an anthropomorphic phantom, and the second method was based on computer modeling of the imaging system using an anthropomorphic voxel phantom. The tube voltage was varied within a broad range (50-150 kV), including those values typically used with screen-film radiography. The tube charge was altered so that the same effective dose was achieved for each projection. Two... (More)
- The aim of this work was to study the dependence of image quality in digital chest and pelvis radiography on tube voltage, and to explore correlations between clinical and physical measures of image quality. The effect on image quality of tube voltage in these two examinations was assessed using two methods. The first method relies on radiologists' observations of images of an anthropomorphic phantom, and the second method was based on computer modeling of the imaging system using an anthropomorphic voxel phantom. The tube voltage was varied within a broad range (50-150 kV), including those values typically used with screen-film radiography. The tube charge was altered so that the same effective dose was achieved for each projection. Two x-ray units were employed using a computed radiography (CR) image detector with standard tube filtration and antiscatter device. Clinical image quality was assessed by a group of radiologists using a visual grading analysis (VGA) technique based on the revised CEC image criteria. Physical image quality was derived from a Monte Carlo computer model in terms of the signal-to-noise ratio, SNR, of anatomical structures corresponding to the image criteria. Both the VGAS (visual grading analysis score) and SNR decrease with increasing tube voltage in both chest PA and pelvis AP examinations, indicating superior performance if lower tube voltages are employed. Hence, a positive correlation between clinical and physical measures of image quality was found. The pros and cons of using lower tube voltages with CR digital radiography than typically used in analog screen-film radiography are discussed, as well as the relevance of using VGAS and quantum-noise SNR as measures of image quality in pelvis and chest radiography. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/685772
- author
- Sandborg, Michael
; Tingberg, Anders
LU
; Ullman, Gustaf
; Dance, David R.
and Carlsson, Gudrun Alm
- organization
- publishing date
- 2006
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- chest radiography, signal-to-noise ratio, visual grading analysis, tube voltage, image quality, effective dose, pelvis radiography, computed, radiography
- in
- Medical Physics
- volume
- 33
- issue
- 11
- pages
- 4169 - 4175
- publisher
- American Association of Physicists in Medicine
- external identifiers
-
- wos:000242250800021
- scopus:33750573935
- pmid:17153395
- ISSN
- 0094-2405
- DOI
- 10.1118/1.2362871
- language
- English
- LU publication?
- yes
- id
- dacc12c4-f807-4b39-8161-20294d2dfb5c (old id 685772)
- date added to LUP
- 2016-04-01 16:14:01
- date last changed
- 2024-03-15 01:55:19
@article{dacc12c4-f807-4b39-8161-20294d2dfb5c,
abstract = {{The aim of this work was to study the dependence of image quality in digital chest and pelvis radiography on tube voltage, and to explore correlations between clinical and physical measures of image quality. The effect on image quality of tube voltage in these two examinations was assessed using two methods. The first method relies on radiologists' observations of images of an anthropomorphic phantom, and the second method was based on computer modeling of the imaging system using an anthropomorphic voxel phantom. The tube voltage was varied within a broad range (50-150 kV), including those values typically used with screen-film radiography. The tube charge was altered so that the same effective dose was achieved for each projection. Two x-ray units were employed using a computed radiography (CR) image detector with standard tube filtration and antiscatter device. Clinical image quality was assessed by a group of radiologists using a visual grading analysis (VGA) technique based on the revised CEC image criteria. Physical image quality was derived from a Monte Carlo computer model in terms of the signal-to-noise ratio, SNR, of anatomical structures corresponding to the image criteria. Both the VGAS (visual grading analysis score) and SNR decrease with increasing tube voltage in both chest PA and pelvis AP examinations, indicating superior performance if lower tube voltages are employed. Hence, a positive correlation between clinical and physical measures of image quality was found. The pros and cons of using lower tube voltages with CR digital radiography than typically used in analog screen-film radiography are discussed, as well as the relevance of using VGAS and quantum-noise SNR as measures of image quality in pelvis and chest radiography.}},
author = {{Sandborg, Michael and Tingberg, Anders and Ullman, Gustaf and Dance, David R. and Carlsson, Gudrun Alm}},
issn = {{0094-2405}},
keywords = {{chest radiography; signal-to-noise ratio; visual grading analysis; tube voltage; image quality; effective dose; pelvis radiography; computed; radiography}},
language = {{eng}},
number = {{11}},
pages = {{4169--4175}},
publisher = {{American Association of Physicists in Medicine}},
series = {{Medical Physics}},
title = {{Comparison of clinical and physical measures of image quality in chest and pelvis computed radiography at different tube voltages}},
url = {{http://dx.doi.org/10.1118/1.2362871}},
doi = {{10.1118/1.2362871}},
volume = {{33}},
year = {{2006}},
}