Should 3K zoom function be used for detection of pneumothorax in cesium iodide/amorphous silicon flat-panel detector radiographs presented on 1K-matrix soft copies?

The purpose of the study was to evaluate observer performance in the detection of pneumothorax with cesium iodide and amorphous silicon flat-panel detector radiography (CsI/a-Si FDR) presented as 1K and 3K soft-copy images. Forty patients with and 40 patients without pneumothorax diagnosed on previo...

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Bibliographic Details
Published in:European radiology 2006-12, Vol.16 (12), p.2768-2774
Main Authors: Herrmann, Karin A, Bonél, H M, Stäbler, A, Voelk, M, Strotzer, M, Zech, C J, Reiser, M F
Format: Article
Language:English
Subjects:
Adult
Aged
Amorphous silicon
Area Under Curve
Cesium
Cesium iodides
Contrast Media
Digital imaging
Female
Humans
Iodides
Iohexol - analogs & derivatives
Male
Medical imaging
Middle Aged
Observer Variation
Observers
Phosphors
Pneumothorax
Pneumothorax - diagnostic imaging
Radiographs
Radiography
Radiography, Thoracic - instrumentation
Silicon
Statistical analysis
Statistical methods
X-Ray Intensifying Screens
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Summary:The purpose of the study was to evaluate observer performance in the detection of pneumothorax with cesium iodide and amorphous silicon flat-panel detector radiography (CsI/a-Si FDR) presented as 1K and 3K soft-copy images. Forty patients with and 40 patients without pneumothorax diagnosed on previous and subsequent digital storage phosphor radiography (SPR, gold standard) had follow-up chest radiographs with CsI/a-Si FDR. Four observers confirmed or excluded the diagnosis of pneumothorax according to a five-point scale first on the 1K soft-copy image and then with help of 3K zoom function (1K monitor). Receiver operating characteristic (ROC) analysis was performed for each modality (1K and 3K). The area under the curve (AUC) values for each observer were 0.7815, 0.7779, 0.7946 and 0.7066 with 1K-matrix soft copies and 0.8123, 0.7997, 0.8078 and 0.7522 with 3K zoom. Overall detection of pneumothorax was better with 3K zoom. Differences between the two display methods were not statistically significant in 3 of 4 observers (p-values between 0.13 and 0.44; observer 4: p = 0.02). The detection of pneumothorax with 3K zoom is better than with 1K soft copy but not at a statistically significant level. Differences between both display methods may be subtle. Still, our results indicate that 3K zoom should be employed in clinical practice.
ISSN:0938-7994
1432-1084
DOI:10.1007/s00330-006-0344-9