Accuracy validation of incident photon fluence on detective quantum efficiency in mammography

Australasian Physical & Engineering Sciences in Medicine
Tomonobu HabaNatsuki Otani

Abstract

X-ray image evaluation is commonly performed by determining the detective quantum efficiency (DQE). DQE is calculated with a presampled modulation transfer function (MTF), incident photon fluence, and digital noise power spectrum (NPS). Accurate evaluation of MTF, incident photon fluence, and NPS is important for precise DQE determination. In this study, we focused on the accuracy of the incident photon fluence in mammography. The incident photon fluence is calculated using the squared signal-to-noise ratio (SNRin2) value as specified in the International Electrotechnical Commission (IEC) 62220-1-2 report. However, the reported SNRin2 values were determined using a computer program, and the reported values may differ from those calculated from an X-ray spectrum that is measured with actual mammography equipment. Therefore, we evaluated the error range of reported SNRin2 values in mammography to assess the accuracy of the incident photon fluence. First, X-ray spectra from various mammography systems were measured with a CdTe spectrometer. Six mammographic X-ray units were used in this study. Second, the SNRin2 values were calculated from the measured X-ray spectra. The calculated values were compared to the reported values. The ...Continue Reading

References

Jul 1, 1979·Physics in Medicine and Biology·W W Seelentag, W Panzer
Aug 18, 2000·Medical Physics·M MatsumotoH Kanamori
Aug 30, 2002·The British Journal of Radiology·S MiyajimaM Matsumoto
May 8, 2013·Radiological Physics and Technology·Tomonobu HabaShuji Koyama

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Citations

Jun 12, 2020·Physical and Engineering Sciences in Medicine·Sho Maruyama, Masayuki Shimosegawa

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Methods Mentioned

BETA
X-ray
IEC

Software Mentioned

AMULET
MAMMOMAT

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