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- Title
Detection of small peripheral lung cancer by digital chest radiography. Performance of unprocessed versus unsharp mask-processed images.
- Authors
Yang, Z.-G.; Sone, S.; Li, F.; Takashima, S.; Maruyama, Y.; Hasegawa, M.; Hanamura, K.; Asakura, K.
- Abstract
<bold>Purpose: </bold>To clarify whether processed digital chest radiography can improve the detection rate for small peripheral lung cancer.<bold>Material and Methods: </bold>Five radiologists independently interpreted 54 digitized chest radiographs of 18 patients with small peripheral lung cancers measuring less than 20 mm, which were displayed following 3 types of digital processing: 1) an original version; 2) unsharp mask processing with a type 1 filter (very low-frequency-enhancing, mid-frequency-suppressing, and high-frequency-enhancing filter); and 3) unsharp mask processing with a type 2 filter (very low- and high-frequency-enhancing filter). A total of 1,620 pooled observations were evaluated by receiver operating characteristic (ROC) analysis.<bold>Results: </bold>The mean area under the ROC curves was 0.68 for the type 1 filter, 0.68 for the type 2 filter, and 0.65 for the unprocessed (original) image. There were no statistically significant differences among these 3 kinds of image processing (p>0.05). In all types of images, the small lung cancer with an alveolar lining tumor growth was less visible than a solid tumor growth (p<0.01); the sensitivity increased with tumor size when the 3 groups of cancers, those measuring less than 10 mm, 11-15 mm, and 16-20 mm, were compared (p<0.01).<bold>Conclusion: </bold>Unsharp mask-image processing of digital chest radiography will not improve the detection rate of small peripheral lung cancer, probably due to a substantial drawback: the limited conspicuity of cancer lesions in the surrounding lung and superposition of structures.
- Subjects
LUNG cancer; NODULAR disease; RADIOTHERAPY
- Publication
Acta Radiologica, 1999, Vol 40, Issue 5, p505
- ISSN
0284-1851
- Publication type
journal article
- DOI
10.3109/02841859909175575