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An alignment method for mammographic X-ray spectroscopy under clinical conditions

S Miyajima, MS 1 K Imagawa, MS 1 and M Matsumoto, PhD 2

1 Graduate School of Medicine, Course of Health Sciences and 2 School of Allied Health Sciences, Faculty of Medicine, Osaka University, 1-7 Yamadaoka, Suita, Osaka, 565-0871, Japan



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  		Figure 1. (a) The CdZnTe detector (upper left), the pencil-shaped laser device with holder (lower) and the detector case (upper right) used in this study. (b) The laser device with holder inserted in the detector case. A drawing pin is put at the end of the laser device to indicate the direction of the laser beam (arrow). (c) The detector inserted in the detector case.

 


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  		Figure 2. Procedure to align the focal spot, the collimator and the detector. (a) Position the central mark of the fluorescent screen at the point of interest in an X-ray field, and adjust the tube collimator near an X-ray port so that the X-ray image on the screen corresponds to the central mark of the screen. (b) Adjust the laser device with the detector case in such a way that the laser beam passes through the aperture of the tube collimator and the end of the laser device aims at the central mark of the screen. (c) Replace the laser device with the detector and collimate the beam at the detector window.

 


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  		Figure 3. Experimental set-up in a clinical mammographic unit.

 


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  		Figure 4. X-ray spectra measured with the CdZnTe detector in this study. The target was a compound of molybdenum (Mo) and tungsten (W): the target contained 5% W by weight. Additional filters were 0.03 mm Mo and 0.5 mm aluminium (Al). The tube voltage was 28 kV. The small peaks at 8.4 keV and 9.4 keV were attributed to tungsten-L X-rays from the collimator.

 




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