Characterization of a CMOS detector for limited-view mammography

Idris A. Elbakri

doi:10.1117/12.708347

15 March 2007 Characterization of a CMOS detector for limited-view mammography

Idris A. Elbakri

Proceedings Volume 6510, Medical Imaging 2007: Physics of Medical Imaging; 651049 (2007) https://doi.org/10.1117/12.708347
Event: Medical Imaging, 2007, San Diego, CA, United States

Abstract

Sensors based on complementary metal oxide semiconductors (CMOS) technology have recently been considered for mammography applications. CMOS offers the advantages of lower cost and relative ease of fabrications. We report on the evaluation of a CMOS imager (C9730DK, Hamamatsu Corporation) with 14-bit digitization and 50-micron detector element (del) resolution. The imager has an active area of 5 x 5 cm and uses 160-micron layer of needle-crystal CsI (55 mg/cc) to convert x-rays to light. The detector is suitable for spot and specimen imaging and image-guided biopsy. To evaluate resolution performance, we measured the modulation transfer function (MTF) using the slanted edge method. We also measured the normalized noise power spectrum (NNPS) using Fourier analysis of uniform images. The MTF and NNPS were used to determine the detective quantum efficiency (DQE) of the detector. The detector was characterized using a molybdenum target/molybdenum filter mammography x-ray source operated at 28 kVp with 44mm of PMMA added to mimic clinical beam quality (HVL = 0.62 mm Al). Our analysis showed that the imager had a linear response. The MTF was 28% at 5 lp/mm and 8% at 10 lp/mm. The product of the NNPS and exposure showed that the detector was quantum limited. The DQE near 0 lp/mm was in the 55-60% range. The DQE and MTF performance of the CMOS detector are comparable to published values for other digital mammography detectors.

Citation Download Citation

Idris A. Elbakri "Characterization of a CMOS detector for limited-view mammography", Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 651049 (15 March 2007); https://doi.org/10.1117/12.708347

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