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Questions and Answers
What is indicated by an upslope without a subsequent fall in activity on a renogram?
What is indicated by an upslope without a subsequent fall in activity on a renogram?
When should furosemide (Lasix) be administered during a renogram?
When should furosemide (Lasix) be administered during a renogram?
During a renal perfusion imaging study, how long should the sequential images be taken after the flow measurement?
During a renal perfusion imaging study, how long should the sequential images be taken after the flow measurement?
Which phase of the renogram corresponds to the concentration of the tracer in the kidneys?
Which phase of the renogram corresponds to the concentration of the tracer in the kidneys?
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What characterizes normal findings in a renogram regarding tracer activity?
What characterizes normal findings in a renogram regarding tracer activity?
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Study Notes
Renal Function Imaging (Renogram)
- Radiopharmaceuticals: Used in renography include 99mTc-mertiatide (MAG3) and 99mTc-pentetate (DTPA).
Renal Function Assessment
- Generates a time-activity curve (renogram): To evaluate kidney function.
Acquisition Procedure
- Patient position: Prone or supine, with posterior projection over kidneys. For transplants, supine with detector over the iliac fossa.
- Tracer administration: Intravenous injection of the radiopharmaceutical.
- Image acquisition: Dynamic flow study, followed by sequential images (30-60 seconds) over 20-30 minutes. All images are saved digitally.
- Ureteral Obstruction: If tracer remains in the renal pelvis or ureteropelvic junction, administer furosemide (Lasix) to evaluate for obstruction.
Normal Renogram Findings
- Tracer uptake: Rapid uptake.
- Peak activity: 3-5 minutes after injection.
- Excretion: Gradual tracer decrease.
- Visualisation: Renal pelvis and bladder activity visible within 3-6 minutes.
Renogram Phases
- Vascular phase: Tracer arrival.
- Secretory phase: Tracer concentration in the kidneys.
- Excretory phase: Tracer excretion.
Abnormal Renogram Findings
- Obstruction indication: Upslope in activity curve without a subsequent decrease: Suggests obstruction of the renal tubules preventing excretion.
- Poor renal function: A persistently low activity curve throughout the entire renogram indicates poor kidney function.
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Description
Test your knowledge on renal function imaging techniques, specifically the renogram. This quiz covers essential topics such as radiopharmaceuticals, acquisition procedures, and normal renogram findings. Understand how these factors contribute to kidney function assessment.
