We describe a portable system for mammographic x-ray spectroscopy, based on a 2x2x1 mm3cadmium telluride (CdTe) solid state detector, that is greatly improved over a similar system basedon a 3x3x2 mm3 cadmium zinc telluride (CZT) solid state detector evaluated in an earlier work.The CdTe system utilized new pinhole collimators and an alignment device that facilitated measurementof mammographic x-ray spectra. Mammographic x-ray spectra acquired by each systemwere comparable. Half value layer measurements obtained using an ion chamber agreed closelywith those derived from the x-ray spectra measured by either detector. The faster electronics andother features of the CdTe detector allowed its use with a larger pinhole collimator than could beused with the CZT detector. Additionally, the improved pinhole collimator and alignment featuresof the apparatus permitted much more rapid setup for acquisition of x-ray spectra than was possibleon the system described in the earlier work. These improvements in detector technology, collimationand ease of alignment, as well as low cost, make this apparatus attractive as a tool for bothlaboratory research and advanced mammography quality control.
|Numero di pagine||9|
|Stato di pubblicazione||Published - 2006|
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