Position Genitourinary Studies - ARRT Radiography Exam

1. Which breathing instruction is used for an AP supine KUB radiograph?

   Suspend respiration at the end of expiration. Minimizes diaphragmatic motion and positions the kidneys lower in the abdomen for better inclusion and reduced blurring.

2. What anatomy must be included on a KUB for an IVU/IVP series?

   From kidneys (T12) through the symphysis pubis. Ensures comprehensive coverage of the entire urinary system from renal origin to bladder outlet for complete evaluation during intravenous urography.

3. Which contrast principle best reduces the risk of adverse reactions in GU studies?

   Screen for iodine allergy and renal function impairment before contrast. Pre-procedure screening identifies risks like anaphylaxis or nephrotoxicity, ensuring safe contrast use in genitourinary procedures.

4. Identify the correct centering for a routine AP cystogram image of the bladder.

   MSP about $2$ inches ($5$ cm) above the pubic symphysis. Centering superior to the symphysis targets the filled bladder's position, ensuring complete inclusion on the radiograph.

5. What is the primary purpose of a KUB radiograph in a genitourinary study?

   Baseline image of kidneys, ureters, bladder; detects calcifications. Serves as a preliminary scout to visualize the urinary tract and identify potential obstructions or abnormalities before contrast administration.

6. Which projection best demonstrates the female urethra during a VCUG?

   AP. AP projection aligns the short female urethra perpendicularly, enabling clear visualization without elongation or overlap.

7. Which position is preferred to demonstrate ureters with less spinal superimposition in IVU/IVP?

   AP obliques (RPO/LPO). Oblique views project the ureters laterally away from the vertebral column, improving visibility and diagnostic accuracy.

8. Which contrast type is used for an IVU/IVP examination?

   Water-soluble iodinated contrast, injected intravenously. Intravenous administration allows excretion through the kidneys, opacifying the entire urinary tract for functional evaluation.

9. What is the correct patient position for a routine KUB radiograph?

   AP supine. Allows optimal visualization of the kidneys, ureters, and bladder without distortion, providing a standard baseline for genitourinary assessment.

10. Which contrast type is used for a cystogram to evaluate the urinary bladder?

    Water-soluble iodinated contrast via urinary catheter. Catheter instillation fills the bladder retrograde, allowing evaluation of integrity, reflux, or abnormalities without systemic effects.

11. Where is the CR centered for an upright AP abdomen used as an upright KUB?

    MSP about $2$ inches ($5$ cm) above the iliac crests. Compensates for the lower diaphragmatic position in upright stance to ensure inclusion of upper abdominal structures like the kidneys.

12. Which position best demonstrates the urinary bladder and distal ureters without superimposition?

    AP axial (Taylor method). Axial projection elongates the bladder and separates distal ureters from overlying structures for clearer evaluation.

13. What is the typical body rotation for posterior obliques (RPO/LPO) in an IVU/IVP?

    About 30^. A 30-degree rotation aligns the downside kidney parallel to the image receptor, optimizing visualization of renal structures.

14. Where is the CR centered for AP oblique (RPO/LPO) kidneys during an IVU/IVP?

    Midway between MSP and elevated ASIS, at iliac crest level. Centering laterally at the iliac crest level targets the elevated kidney, ensuring it is optimally positioned on the radiograph.

15. What CR angle and centering are used for the AP axial (Taylor) bladder view?

    Angle 10^–15^ caudad to MSP at the pubic symphysis. Caudad angulation projects the bladder inferiorly, reducing overlap with pubic bones and enhancing visualization of distal ureters.

16. What is the purpose of the postvoid image in an IVU/IVP series?

    Evaluates bladder emptying and residual urine. Postvoid imaging assesses bladder function by revealing any retained contrast, indicating potential outlet obstruction or dysfunction.

17. Which position is commonly used for the postvoid bladder image in IVU/IVP?

    AP (or AP axial Taylor if needed). AP projection provides a direct view of the bladder post-voiding, with axial used if superimposition needs to be minimized.

18. Which projection best demonstrates the male urethra during a VCUG?

    Oblique (typically 30^–45^). Oblique positioning opens the curved male urethra, preventing superimposition and allowing detailed assessment during voiding.

19. Which position is used to demonstrate the kidneys parallel to the IR in an IVU/IVP?

    AP oblique (RPO or LPO). Oblique positioning rotates the kidneys into profile, minimizing superimposition with the spine for detailed renal assessment.

20. Which contrast type is used for a retrograde pyelogram?

    Water-soluble iodinated contrast, administered via ureteral catheters. Retrograde filling via catheters directly opacifies the ureters and renal pelvis, bypassing renal function for structural assessment.

21. What is the preferred position for an upright KUB, and why is it obtained?

    AP upright; demonstrates air-fluid levels and free intraperitoneal air. Upright positioning allows gravity to reveal pathological fluid accumulations or gas patterns not visible in supine views.

22. In an RPO for IVU/IVP, which kidney is demonstrated parallel to the IR?

    Right kidney (downside kidney). In RPO, the right kidney is positioned closest to the IR, allowing it to be projected without distortion for accurate imaging.

23. In an LPO for IVU/IVP, which kidney is demonstrated parallel to the IR?

    Left kidney (downside kidney). In LPO, the left kidney is positioned closest to the IR, enabling clear demonstration without rotational distortion.

24. Where is the CR centered for an AP supine KUB radiograph?

    MSP at the level of iliac crests (L4–L5). Aligns the central ray with the mid-abdomen to include the full extent of the urinary tract on the image receptor.

25. Which contrast agent is used for a voiding cystourethrogram (VCUG)?

    Water-soluble iodinated contrast instilled into the bladder. Bladder instillation provides opacification for dynamic imaging during voiding to assess urethral and vesicoureteral function.

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