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CT CHAP 2 con't

Data Acquisition

What is the average of kV in CT? 120-140kV
What does using a high kV do for the life of the tube? Reducing heat load= extending life
What does high kV do for the patient? Hardens the beam so that it reduces patient dose.
How does having high kV reduce heat? by being able to use a lower mA.
What are some cooling systems that could be located in the gantry? blowers, filters, or devices that perform oil-to-air heat exchange
What is the anode made of and the atomic number? Tungsten 74
How do you we reduce patient dose and minimize image artifact, improving image quality? by using a compensating filter to shape the xray beam
What do collimators do? restrict xray beam and reduce scatter
What is a common filter? Bow tie, because of its shape
What is the range of sizes of collimators? 0.5 - 10 mm
Describe what predictor collimation. Located below the patient, shaped the beam after passing thru patient, before hitting the detector, commonly referred to as post patient collimation.
Created by: brandyellen