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Ch 16 Positioning

Ch 16 Radiographic Positioning

What are the 4 reasons a scout projection is taken before the injection of contrast media for an IVU? To verify patient preperation, To determine whether exposure factors are acceptable, To verify positioning, To detect any abnormal calcifications.
Which ionization chambers should be activated for an AP scout projection? Upper right & left ionization chambers
How many tomograms are usually produced during a routine IVU? Three
What is the formula to figure out the correct exposure time for a tomogram? Exposure Time = Amplitude (inches)/Rate (inches per second)
What is the formula to figure out teh correct rate of travel for a tomograom? Rate of Travel = Amplitude (inches)/Exposure Time
What is the term for a tomogram taken at 10 degrees or less? Zonogram
How do tube angles relate to section slices in tomograms? Wide angles of tube movement (>10 degrees) produce thin sections. Longer the amplitude, wider the angle, thinner section. Narrow angles of tube movement (<10 degrees) produce thick sections. The shorter the amplitude, narrower the angle, thicker section.
What is the length or angle of tube travel called during a tomogram? Amplitude
How does SID relate to section slices? Shorter SID produces a thinner section. Increased SID produces a thicker section.
At what stage of an IVU is the renal parenchyma best seen? Within 1 minute following injection
Where should the pneumatic paddle be placed for ureteric compression phase of the IVU? Just medial to the ASIS and lateral to the spine (placed over the outer pelvic brim).
What specific anatomy is demonstrated during a retrograde ureterogram? Primarily the ureters
What can be done to enhance filling of the calyces of the kidney if ureteric compression is contraindicated? Placing the patient in a 15 degree Trendelenburg position
What CR angle is used for the AP projection taken during a cystogram? 10-15 degree caudad
Which specific position is recommended for a male patient during a voiding cystourethrogram? 30 degrees RPO
Created by: jamestkelley