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PHYS1250 Image Quality in Diagnostic Radiography2024
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PHYS1250 Image Quality in Diagnostic Radiography2024
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PHYS1250 Image Quality in DiagnosticRadiography2024
Image Quality
1. Radiographic Contrast
2. Geometric Properties
1. Radiographic contrast
1. Subject Contrast
2. Detector Contrast
6 Ways to Show Appreciation for Your Child's Teacher
2. Geometric Properties
1. Detail
2. Distortion
Radiographic Contrast
- Describes the differences between shades of grey in an image
- Allows us to distinguish anatomical parts from each other
- Subject contrast: differences in x-ray intensities emerging from the patient
- Detector contrast: how many x-rays hit the detector that get picked up by detector
, 1. Subject Contrast
Things that affect this are:
- Applied kVp
Increased voltage = more penetration through body = less attenuation = more radiation hitting detector BUT =
less subject contrast due to scattered radiation
- Anatomical Differences
Greater differences produces higher contrast
Differential absorption= Photoelectric Effect
- Contrast Mediums in cavities to increase contrast
kVp
- More penetration
- Increase in voltage
- More dose
- Less contrast due to more scatter
- Use of filters, grids introduced
- If kVp goes up mAs goes down to balance it out (the amount of x-rays)
Filters
- Most common = Aluminium (Al)
- Removes low energy x-rays which get totally absorbed from patient
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