R T 201: DIGITAL RADIOGRAPHY FOR RADIOLOGIC TECHNOLOGISTS
Foothill College Course Outline of Record
|Hours:||6 lecture per quarter (6 total per quarter)|
|Prerequisite:||Current certification in Radiologic Technology.|
|Degree & Credit Status:||Non-Degree-Applicable Credit Course|
|Grade Type:||Letter Grade (Request for Pass/No Pass)|
Student Learning Outcomes
- Assess the components of both CR and DR digital radiography systems in order to maximize radiation protection of the patient in the clinical setting.
- Describe the utilization of exposure indexes for various manufacturers and the effects of technical factor selection.
The student will be able to:
A. Compare and contrast the computed radiography digital system with the direct radiography digital system.
B. Examine the potential impact the properties of digital radiographic systems have on patient exposure and methods of practicing the As Low As Reasonably Achievable (ALARA) concept with digital systems.
C. Evaluate manipulation of technical factors and the effect on exposure indicators of various systems.
A. CR vs. DR systems
1. Detector types
a. Direct conversion and thin film transistor (TFT) arrays
1) Amorphous selenium
b. Indirect conversion and thin film transistor (TFT) arrays
1) Amorphous silicon
c. Charge-coupled device (CCD)
d. Photostimulable phosphor (PSP) plate
1) Turbid phosphors
2) Columnar phosphors
B. Detector properties
1. Evaluation of detector characteristics
a. Detective quantum efficiency (DQE)
b. Modulation transfer function (MTF)
c. Spatial resolution
2. Dynamic range
3. Raw data extraction
a. Data extraction
b. Analog to digital conversion
c. Exposure field recognition
d. Region of interest (ROI)
e. Histogram analysis
f. Exposure index
C. Exposure indicators and deviation index
a. Deviation index (DI)
b. Target Index (TI)
c. Exposure indicator issues
1) Centering and beam collimation
2) Optimal value ranges
3) Effect of utilizing the 15% rule
4) Mathematical relationship between altering technique or SID on exposure index
5) Difficulties working in environments with multiple exposure indicator types
Special Facilities and/or Equipment
Method(s) of Evaluation
Methods of evaluation may include, but are not limited to:
B. Participation in class discussion
Method(s) of Instruction
Methods of instruction may include, but are not limited to: lecture, discussion, cooperative learning exercises, and demonstration.
Representative Text(s) and Other Materials
Instructor prepared materials.
Types and/or Examples of Required Reading, Writing, and Outside of Class Assignments
Completion of a behavior survey related to technical factor alteration and attention to exposure indexes as a methodology for evaluating image quality in the digital radiography environment.