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Trends in image quality in high magnification digital specimen cabinet radiography

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

View larger version (25K): [in a new window]   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.

View larger version (20K): [in a new window]   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.

View larger version (60K): [in a new window]   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.

View larger version (158K): [in a new window]   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.