Radiology
Mobile displays have the potential to increase the flexibility of consulting radiologists if they can be shown to be comparable to traditional display modalities. A study was performed comparing a mobile display iPad 2 with a larger liquid crystal display (LCD) for the diagnosis of tuberculosis (TB) on chest radiography (Abboud et al., [19]). De-identified images of 240 chest X-rays were transferred from a PACS workstation (LCD) to an iPad 2 tablet. The images were reviewed independently by 5 radiologists and were graded as positive or negative for TB on both the LCD and the iPad 2. The reviews occurred at different times to avoid recall bias.
A database of > 500 chest X-rays was created from TB screening films over a 4-month period. Of these, 200 cases originally interpreted as TB-negative and 40 cases originally interpreted as TB-positive were selected at random for study. The images were re-reviewed using both an LCD and an iPad 2 imaging display, albeit at different times. The results were as shown in Table 3.21.
Table 3.21 Comparison of TB screening results using an LCD and iPad 2 display
The selection of images for this study was enriched to increase the number of images originally interpreted as positive. Suppose the underlying percentage of positive TB tests is 10% in a large sample of chest X-rays assessed by LCD.
If a subject tests positive on an iPad 2 display, then what is the
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EBK FUNDAMENTALS OF BIOSTATISTICS
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