Johnston R E, Washburn D, Pisano E, Burns C, Thomlinson W C, Chapman L D, Arfelli F, Gmur N F, Zhong Z, Sayers D
Department of Radiology, University of North Carolina, Chapel Hill 27599, USA.
Radiology. 1996 Sep;200(3):659-63. doi: 10.1148/radiology.200.3.8756911.
To explore the potential improvement in image contrast for breast imaging with use of monoenergetic photons.
The x-ray energy available from the National Synchrotron Light Source is from 5 to over 50 keV. A specific energy is selected with a tunable crystal monochromator. The object is scanned with a narrow beam of 80.0 x 0.5 mm. Mammography phantoms were imaged with plate and film as the imaging detectors. Phantom images were obtained at 16-24 keV and compared with images obtained with a conventional mammographic unit.
Preliminary findings indicate improved image contrast of the monoenergetic images compared with that obtained from the conventional x-ray source, particularly at 18 keV and below.
Pilot results are encouraging, and the authors presently continue to explore monoenergetic photon imaging with improved instrumentation, scatter rejection, and use of tissue samples.
探讨使用单能光子进行乳腺成像时图像对比度的潜在改善。
国家同步辐射光源提供的X射线能量范围为5至超过50keV。使用可调谐晶体单色仪选择特定能量。用80.0×0.5mm的窄束扫描物体。使用平板和胶片作为成像探测器对乳腺摄影模体进行成像。在16 - 24keV下获得模体图像，并与使用传统乳腺摄影设备获得的图像进行比较。
初步研究结果表明，与传统X射线源获得的图像相比，单能图像的对比度有所改善，尤其是在18keV及以下。
初步结果令人鼓舞，作者目前继续使用改进的仪器、散射抑制技术以及组织样本探索单能光子成像。
