Radioisotope renal imaging

Radioisotope renal imaging

99m The metastable radioisotope Tc emits gamma rays during 99 an isomeric transition to Tc. It has a 6-hour emission half-life and a 1-day biological half-life, so imaging with low exposure is 99m possible. For static imaging, Tc is linked to DMSA and given intravenously; an image is captured after 2–3 hours to assess renal morphology (e.g. agenesis and duplex systems), structure (e.g. renal scarring in reflux nephropathy) and function. For 99m dynamic imaging, Tc is linked to diethylenetriaminepenta - acetate (DTPA) or MAG-3 and given intravenously; a series compromised, the kidney is not imaged; if it is well perfused but partially obstructed, delayed transit is seen. Activity curves and comparison with the contralateral kidney are informative. MAG-3 is preferred to DTPA in neonates and children with impaired function and when an obstruction is suspected since it is more e ffi ciently extracted from the blood by the proxi mal tubules and clearance correlates with blood flow . After extraction by the proximal tubules, MAG-3 is secreted into the tubular lumen, whereas DTPA is filtered by the glomerulus and /uni00A0 provides a measur e of the glomerular filtration rate. Radioisotope renal imaging

99m The metastable radioisotope Tc emits gamma rays during 99 an isomeric transition to Tc. It has a 6-hour emission half-life and a 1-day biological half-life, so imaging with low exposure is 99m possible. For static imaging, Tc is linked to DMSA and given intravenously; an image is captured after 2–3 hours to assess renal morphology (e.g. agenesis and duplex systems), structure (e.g. renal scarring in reflux nephropathy) and function. For 99m dynamic imaging, Tc is linked to diethylenetriaminepenta - acetate (DTPA) or MAG-3 and given intravenously; a series compromised, the kidney is not imaged; if it is well perfused but partially obstructed, delayed transit is seen. Activity curves and comparison with the contralateral kidney are informative. MAG-3 is preferred to DTPA in neonates and children with impaired function and when an obstruction is suspected since it is more e ffi ciently extracted from the blood by the proxi mal tubules and clearance correlates with blood flow . After extraction by the proximal tubules, MAG-3 is secreted into the tubular lumen, whereas DTPA is filtered by the glomerulus and /uni00A0 provides a measur e of the glomerular filtration rate. Radioisotope renal imaging

99m The metastable radioisotope Tc emits gamma rays during 99 an isomeric transition to Tc. It has a 6-hour emission half-life and a 1-day biological half-life, so imaging with low exposure is 99m possible. For static imaging, Tc is linked to DMSA and given intravenously; an image is captured after 2–3 hours to assess renal morphology (e.g. agenesis and duplex systems), structure (e.g. renal scarring in reflux nephropathy) and function. For 99m dynamic imaging, Tc is linked to diethylenetriaminepenta - acetate (DTPA) or MAG-3 and given intravenously; a series compromised, the kidney is not imaged; if it is well perfused but partially obstructed, delayed transit is seen. Activity curves and comparison with the contralateral kidney are informative. MAG-3 is preferred to DTPA in neonates and children with impaired function and when an obstruction is suspected since it is more e ffi ciently extracted from the blood by the proxi mal tubules and clearance correlates with blood flow . After extraction by the proximal tubules, MAG-3 is secreted into the tubular lumen, whereas DTPA is filtered by the glomerulus and /uni00A0 provides a measur e of the glomerular filtration rate.