TY - JOUR
T1 - New CR system with pixel size of 50μm for digital mammography
T2 - Physical imaging properties and detection of subtle microcalcifications
AU - Ideguchi, Tadamitsu
AU - Higashida, Yoshiharu
AU - Kawaji, Yasuyuki
AU - Sasaki, Mitsuo
AU - Zaizen, Makoto
AU - Shibayama, Rei
AU - Nakamura, Yumiko
AU - Koyanagi, Kimihiko
AU - Ikeda, Hirotaka
AU - Ohki, Masafumi
AU - Toyofuku, Fukai
AU - Muranaka, Toru
PY - 2004
Y1 - 2004
N2 - Purpose: To investigate the physical imaging properties and detection of simulated microcalcifications of a new computed radiography (CR) system with a pixel size of 50μm for digital mammography. Materials and Methods: New and conventional CR were employed in this study. The new CR system included a high-resolution imaging plate coupled with the FCR5000MA (50μm pixel pitch) including transparent support and a dual-sided reader. The conventional CR system was coupled with the FCR9000 (100μm pixel pitch). Modulation transfer functions (MTFs) and Wiener spectra (WS) of the new and conventional CR systems were measured. Observer performance tests were conducted to compare the effects of pixel size (50μm vs. 100μm) on the diagnostic accuracy of CR systems in the detection of simulated microcalcifications. Results: The presampling MTF of the new CR system was higher at high frequencies than the conventional CR system. The WS of the new CR system was comparable to that of the conventional CR system at all frequencies. The area under the receiver operating characteristic (ROC) curve (Az) obtained with the new CR and the conventional CR systems were 0.84 and 0.79, respectively. Results showed that the detection of simulated clustered microcalcifications was significantly improved by use of the new CR system compared with the conventional CR system (p<0.05). Conclusion: The new CR mammography system improved physical imaging properties and detection of simulated microcalcifications over conventional CR mammography.
AB - Purpose: To investigate the physical imaging properties and detection of simulated microcalcifications of a new computed radiography (CR) system with a pixel size of 50μm for digital mammography. Materials and Methods: New and conventional CR were employed in this study. The new CR system included a high-resolution imaging plate coupled with the FCR5000MA (50μm pixel pitch) including transparent support and a dual-sided reader. The conventional CR system was coupled with the FCR9000 (100μm pixel pitch). Modulation transfer functions (MTFs) and Wiener spectra (WS) of the new and conventional CR systems were measured. Observer performance tests were conducted to compare the effects of pixel size (50μm vs. 100μm) on the diagnostic accuracy of CR systems in the detection of simulated microcalcifications. Results: The presampling MTF of the new CR system was higher at high frequencies than the conventional CR system. The WS of the new CR system was comparable to that of the conventional CR system at all frequencies. The area under the receiver operating characteristic (ROC) curve (Az) obtained with the new CR and the conventional CR systems were 0.84 and 0.79, respectively. Results showed that the detection of simulated clustered microcalcifications was significantly improved by use of the new CR system compared with the conventional CR system (p<0.05). Conclusion: The new CR mammography system improved physical imaging properties and detection of simulated microcalcifications over conventional CR mammography.
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M3 - Article
C2 - 15468941
AN - SCOPUS:4644285805
SN - 0288-2043
VL - 22
SP - 218
EP - 224
JO - Radiation Medicine - Medical Imaging and Radiation Oncology
JF - Radiation Medicine - Medical Imaging and Radiation Oncology
IS - 4
ER -