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Göteborgs universitets publikationer

Comparison of two methods for evaluation of image quality of lumbar spine radiographs

Författare och institution:
A. Tingberg (-); Magnus Båth (Institutionen för särskilda specialiteter, Avdelningen för radiofysik); Markus Håkansson (Institutionen för särskilda specialiteter, Avdelningen för radiofysik); J. Medin (-); M. Sandborg (-); G. Alm-Carlsson (-); S. Mattsson (-); Lars Gunnar Månsson (Institutionen för särskilda specialiteter, Avdelningen för radiofysik)
Publicerad i:
Progress in Biomedical Optics and Imaging - Proceedings of SPIE, 5372 s. 251-262
ISSN:
1605-7422
Publikationstyp:
Artikel, övrig vetenskaplig
Publiceringsår:
2004
Språk:
engelska
Fulltextlänk:
Sammanfattning (abstract):
Purpose To evaluate the image quality of clinical radiographs with two different methods, and to find correlations between the two methods. Methods Based on fifteen lumbar spine radiographs, two new sets of images were created. A hybrid image set was created by adding two distributions of artificial lesions to each original image. The image quality parameters spatial resolution and noise were manipulated and a total of 210 hybrid images were created. A set of 105 disease-free images was created by applying the same combinations of spatial resolution and noise to the original images. The hybrid images were evaluated with the free-response forced error experiment (FFE) and the normal images with visual grading analysis (VGA) by nine experienced radiologists. Results The VGA study showed that images with low noise are preferred over images with higher noise levels. The alteration of the MTF had a limited influence on the VGA score. For the FFE study the visibility of the lesions was independent of the spatial resolution and the noise level. Discussion In this study we found no correlation between the two methods, probably because the detectability of the artificial lesions was not influenced by the manipulations of noise level and resolution. Hence, the detection of lesions in lumbar spine radiography may not be a quantum-noise limited task. The results show the strength of the VGA technique in terms of detecting small changes in the two image quality parameters. The method is more robust and has a higher statistical power than the ROC related method and could therefore, in some cases, be more suitable for use in optimization studies.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
MEDICIN OCH HÄLSOVETENSKAP ->
Klinisk medicin ->
Radiologi och bildbehandling ->
Radiologi
MEDICIN OCH HÄLSOVETENSKAP ->
Klinisk medicin ->
Radiologi och bildbehandling ->
Radiofysik
Nyckelord:
Added pathology , Diagnostic radiology , European Image Criteria , Evaluation methods for clinical image quality , Free-response forced error (FFE) experiment , Lumbar spine hybrid images , Lumbar spine radiography , Visual grading analysis (VGA)
Postens nummer:
235495
Posten skapad:
2016-04-28 17:40

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