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registry prep 1

registry prep Qs 1

QuestionAnswer
mAs change (GCF) required when adding a 5:1 grid 2 × the original mAs
mAs change (GCF) required when adding a 6:1 grid 3 × the original mAs
mAs change (GCF) required when adding a 8:1 grid 4 × the original mAs
mAs change (GCF) required when adding a 12:1 (or 10:1) grid 5 × the original mAs
mAs change (GCF) required when adding a 16:1 grid 6 × the original mAs
grid ratio formula height of Pb strip/width of interspace
a larger anode angle results in ____ effective FSS increased
anode heel effect is affected how with anode angle? larger angle means less heel effect
smaller anode angle means ____ actual FSS larger
formula for pixel size FOV/image matrix
in a plantodorsal calcaneous the CR is directed in which direction? cephalad
the transformer is divided into what 3 main parts? control console, high voltage, and x-ray tube.
What are the two parts of the high voltage area of the transformer? the step up transformer – primary and secondary sides
Formula for current Ns/Np=Vs/Vp=Ip/Is
The kVp meter is located where in the transformer? on the primary side of the step up transformer
I the transformer, what happens to Volt and Current? volt is stepped down, current is stepped up
Formula for ESE dose(mR) X time
Approximate ESE in for a chest x-ray 10mR
Approximate ESE for a C-spine x-ray 150mR
Approximate ESE for an L-spine x-ray 300mR
Approximate ESE for an abdomen x-ray 400mR
Approximate ESE for a pelvis x-ray 150mR
Approximate ESE for an extremity x-ray 50mR
Approximate ESE for a skull x-ray 200mR
When positioning for a Rheese the MSP should be 53 degrees to the IR
When positioning for a Rheese the AML should be 37 degrees to the IR
The most radiosensitive tissues in the body are: lymphocytes, spermatogonia and erythrocytes
The least readiosensitive cells in the body are: fibroblasts, muscle cells and nerve cells
When switching from single phase to 3phase 12 pulse what change to mAs must be made? ½ mAs
When switching from 3 phase 12 pulse to single phase what changes to mAs must be made? 2X mAs
Absorbed dose is measured in: RAD or Gy
Dose equivalent is measured in: REM or SV
Created by: annaluz87
Popular Radiology sets

 

 



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