Podcast
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?
- Rapid tracer absorption
- Normal renal function
- Excess tracer excretion
- Renal tubule obstruction (correct)
When should furosemide (Lasix) be administered during a renogram?
When should furosemide (Lasix) be administered during a renogram?
- After the first thirty seconds of imaging
- At the end of the renogram study
- When tracer activity persists in the renal pelvis or ureteropelvic junction (correct)
- Immediately after tracer administration
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?
- 10 to 15 minutes
- 5 to 10 minutes
- 20 to 30 minutes (correct)
- 30 to 45 minutes
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?
What characterizes normal findings in a renogram regarding tracer activity?
What characterizes normal findings in a renogram regarding tracer activity?
Flashcards
Renogram
Renogram
A nuclear medicine test that measures kidney function by tracking the movement of a radioactive tracer through the kidneys.
Radiopharmaceuticals
Radiopharmaceuticals
Radioactive substances used in nuclear medicine imaging to visualize organs and tissues. Common examples include 99mTc-mertiatide (MAG3) and 99mTc-pentetate (DTPA).
Secretory phase
Secretory phase
The phase of a renogram where the radiotracer is absorbed into the kidneys, indicating kidney function.
Excretory phase
Excretory phase
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Obstruction in Renogram
Obstruction in Renogram
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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.
