Acquisition modalities are the image engines in a picture archiving and communications system (PACS). Of the modality mix, radiography comprises approximately 60–70% of all studies performed in a diagnostic radiology department. Since analog screen-film recording technology is still being used in many hospitals and clinics, the implementation of a PACS for electronic image acquisition, display, and archiving is associated with the conversion of analog to digital radiography technology. But the imaging modalities are much more than radiography. Real-time digital fluoroscopy, interventional angiography, and cardiology studies are producing hundreds to thousands of images per examination. Cross-sectional imaging acquisition systems such as computed tomography (CT), magnetic resonance imaging (MRI), ultrasound (US), single-photon emission computed tomography (SPECT), and positron-emission computed tomography (PET) are expanding rapidly and are in many cases becoming the examinations of choice over projection imaging.
Digital Mammography Compute Radiography Digital Radiography Tomographic Slice Digital Mammography Image
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ACR Accreditation Procedures: Mammography, Ultrasound, Magnetic Resonance Imaging, Computed Tomography, Nuclear Medicine and PET. Available at: http://www.acr.org/accreditation.aspx. Accessed August 25, 2008.