Mammogram Flashcards
What equipment is used in mammography
Equipment is C-Arm
Example: C-Arm is a common piece of equipment used in radiology construction.
What is the standard SID range for mammography
SID usually = 24 – 26 inches or 60.96 cm – 66.04 cm
3D models SID go up to 70 cm.
SID stands for Source-to-Image Distance.
What is the kVp range for older units in mammography
kVp range = 23 – 28 kVp for older units
Modern digital units up to 39 kVp.
Targets = Molybdenum or Rhodium
Focal Spot = 0.1 – 0.6
Compression Paddle
Heel Effect
AEC
Grids : 4:1 or 5:1 lines per inch
kVp refers to peak kilovoltage.
What are the components of a compression device in mammography
Flatten tissue to improve optical density
Even tissue
Lower dose
Improve contrast and spatial resolution
Reduce scatter
Reduce motion
Made of firm plastic
25 – 40 pounds
Uncomfortable
Compression devices are used to compress tissue during imaging procedures.
What are the characteristics of digital mammography in radiology construction?
No film or chemical processing
Integrated in digital systems such as pacs
Slightly higher dose
5 lp/mm
lp/mm stands for line pairs per millimeter.
What is the purpose of AEC in mammography
Positioned after IR
Solid State
Ion Chamber
Measures intensity of x-ray and energy
AEC stands for Automatic Exposure Control.
What are the benefits of 3D Tomo Units in mammography
Acquires multiple thin slices of breast (1mm)
Separates objects at different heights in breast.
Improve diagnosis of superimposed lesions
Combo Mode
2D + 3D imaging mixture
Benefit = superior clinical performance in specificity, the confidence to rule out breast cancer without recalling the patient for further study, and improved sensitivity.
Tomo Units refer to Tomosynthesis Units for breast imaging.
What is the lp/mm range for different imaging modalities in mammography
Gamma Camera 0.1 lp/mm
Magnetic Resonance Imaging 1.5 lp/mm
Computed Tomography 1.5 lp/mm
Diagnostic Ultrasound 2 lp/mm
Fluoroscopy 3 lp/mm
Digital Radiography 5-7 lp/mm
Screen-Film Radiography 8-10 lp/mm
Mammography 15 lp/mm
lp/mm stands for line pairs per millimeter.
