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Health Careers Education
Digital Image Acquisition and Display
This course contains content designed to impart an understanding of the components, principles, and operation of digital imaging systems found in diagnostic radiology. Factors that impact image acquisition, display, archiving, and retrieval are discussed. The guidelines for selecting exposure factors and evaluating images within a digital system will assist students to bridge between film-based and digital imaging systems. Principles of digital system quality assurance and maintenance are presented.
Lara Skaggs
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-Define terminology associated with digital imaging systems.
-Describe the various types of digital receptors.
-Discuss the fundamentals of digital radiography, distinguishing between cassette-based systems and cassette-less systems.
-Compare the image acquisition and extraction of cassette-based vs. cassette-less systems, including detector mechanism, initial image processing, histogram analysis,
automatic rescaling and exposure index determination.
-Describe the evaluative criteria for digital radiography detectors.
-Describe the response of digital detectors to exposure variations.
-Compare the advantages and limits of each system.
-Given the performance criteria for a digital radiography detector, evaluate the spatial resolution and dose effectiveness.
-Compare dynamic range to latitude of a screen/film receptor system to that of a digital radiography system.
-Describe the histogram and the process of histogram analysis as it relates to automatic rescaling and determining an exposure indicator.
-Describe or identify the exposure indices used by each photostimulable phosphor (PSP) based system.
-Describe the difference between dose area-product (DAP) measured with a flat panel system vs. the exposure index for a PSP-based system.
-Relate the receptor exposure indicator values to technical factors, system calibration, part/beam/plate alignment and patient exposure.
-Describe image acquisition precautions necessary for CR imaging.
-Describe the response of PSP systems to background and scatter radiation.
-Utilize appropriate means of scatter control.
-Avoid grid use errors associated with grid cut off and Moire' effect.
-Identify common limitations and technical problems encountered when using PSP systems.
-Employ appropriate beam/part/receptor alignment to avoid histogram analysis errors.
-Describe the various image processing employed for digital images.
-Associate impact of image processing parameters to the image appearance.
-Associate effects of inappropriate processing on image clarity or conspicuity.
-Describe the fundamental physical principles of exposure for digital detectors.
-Apply the fundamental principles to digital detectors.
-Describe the selection of technical factors and technical factor systems to assure appropriate receptor exposure levels for digital detectors.
-Evaluate the effect of a given exposure change on histogram shape, data width and image appearance.
-Describe the conditions that cause quantum mottle in a digital image.
-Formulate a procedure or process to minimize histogram analysis and rescaling errors.
-Describe the exposure precautions and limitations associated with PSP-based systems.
-Avoid poor quality images by observing acquisition precautions.
-Examine the potential impact of digital radiographic systems on patient exposure and methods of practicing the As Low As Reasonably Achievable (ALARA) concept with digital
-Describe Picture Archival and Communications System (PACS) and its function.
-Identify the components of a PACS system.
-Describe patient benefits gained through the use of teleradiology.
-Identify modality types that may be incorporated into a PACS.
-Define Accession Number.
-Describe Work list and correct usage.
-Define Digital Imaging and Communications in medicine (DICOM)
-Describe how an image associated with a radiology order can create a DICOM image.
-Describe data flow for a DICOM image from an imaging modality to a PACS.
-Identify common problems associated with retrieving/viewing images within a PACS.
-Identify the primary uses of the Diagnostic Display Workstation and Clinical Display Workstation.

Registered Radiological Technologist -

ARRT Radiography Curriculum Guide

Bushong, Stewart C.. Radiologic
Science for Technologists. 0-323-02555-2. Philadelphia: Elsevier
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Bushong, Stewart C.. Radiologic
Science for Technologists, Workbook.

0-323-02554-4. Philadelphia:
Elsevier Publishing, 2004.

Eugene D.; Long, Bruce W.; Smith, Barbara J.. Merrill's Atlas of
Radiographic Positioning and Procedures. 0-323-04210-4. Philadelphia: Elsevier Publishing, 2007.

Principles of Radiographic Imaging 4th Ed,
by R. Carlton & A. Adler

Registered Radiological Technologist - ARRT

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Health Science Diagnostic Services Radiologic Technologist