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British Journal of Radiology (2006) 79, 239-243
© 2006 British Institute of Radiology
doi: 10.1259/bjr/24723806

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Trends in image quality in high magnification digital specimen cabinet radiography

I P Birch, MSci, MPhys, C J Kotre, PhD and R Padgett, PhD

Regional Medical Physics Department, Newcastle General Hospital, Westgate Road, Newcastle NE4 6BE, UK


Figure 1
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Figure 1. (a) Pixel value profiles across image edge acquired at various magnification geometries using a phase contrast test object. (b) Pixel value profiles across image edge acquired at various magnification geometries using a non-phase contrast test object.

 

Figure 2
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Figure 2. (a) Image plane system frequency response curves (MTFs) calculated from edge profiles acquired at various magnification geometries using a phase contrast test object. (b) Image plane system frequency response curves (MTFs) calculated from edge profiles acquired at various magnification geometries using a non-phase contrast test object.

 

Figure 3
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Figure 3. 14th Group of Huttner(Type 25a) spatial resolution test object. Images acquired at various magnifications and rescaled. (a) mag x 1, (b) mag x 1.5, (c) mag x 2, (3) mag x 3, (e) mag x 4, (f) mag x 5.

 

Figure 4
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Figure 4. Microcalcification cluster number 5 of Leeds TOR(MAM) mammography test object. Images acquired at various magnifications and rescaled. (a) mag x 1, (b) mag x 1.5, (c) mag x 2, (3) mag x 3, (e) mag x 4, (f) mag x 5.

 





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