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Ch 16 Positioning
Ch 16 Radiographic Positioning
Question | Answer |
---|---|
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 |