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First published online August 17, 2006
British Journal of Radiology (2007) 80, 186-193
© 2007 British Institute of Radiology
doi: 10.1259/bjr/66715796
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The effect of experience on detectability in local area anatomical noise

D S Brettle, PhD 1 E Berry, PhD 2 and M A Smith, PhD 3

1 Department of Medical Physics and Engineering, Leeds Teaching Hospitals NHS Trust, Leeds General Infirmary, Leeds LS1 3EX, 2 Academic Unit of Medical Physics and Centre of Medical Imaging Research and, 3 Institute of Digital Innovation, University of Teesside, Middlesbrough TS1 3BA, UK


Figure 1
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  		Figure 1. MRT1 weighted sagittal head image used for the brain texture. (a) The original image with the seed region indicated by dashed box. (b) A large area synthesized image using the seed area.

 

Figure 2
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  		Figure 2. Computed radiography tibia used for the bone texture.(a) The original image with the seed region indicated by dashed box. (b) A large area synthesized image using the seed area.

 

Figure 3
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  		Figure 3. Simulated designer nodule; 2D image and 3D profile generated using the designer nodule function with a power of 1.5.

 

Figure 4
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  		Figure 4. Example of the test display presented to the observers. Fiducial markers were added to locate the signal exactly at the centre of the background image.(The signal in the right image is shown at a grey level of 40).

 

Figure 5
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  		Figure 5. Histogram showing distribution of results from all observers(n = 101) illustrating the spread of results for each texture and showing outliers, particularly for the brain texture.

 

Figure 6
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  		Figure 6. Group histograms for the large-scale study (n = 101). These results indicate that the bone results are more correlated between the groups than those using the brain texture. (a) Bone results. (b) Brain results.

 




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