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The advantage of a MUGA scan over an echocardiogram or an angiogram is its accuracy. An echocardiogram measures the shortening fraction of the ventricle and is limited by the user's ability. Furthermore, an angiogram is invasive and, often, more expensive. A MUGA scan provides a more accurate representation of cardiac ejection fraction. [1]
RNT contrasts with sealed-source therapy (brachytherapy) where the radionuclide remains in a capsule or metal wire during treatment and needs to be physically placed precisely at the treatment position. [4] When the radionuclides are ligands (such as with Lutathera and Pluvicto), the technique is also known as radioligand therapy. [5]
Radionuclide scanning of the scrotum is the most accurate imaging technique to diagnose testicular torsion, but it is not routinely available. [16] The agent of choice for this purpose is technetium-99m pertechnetate. [17] Initially it provides a radionuclide angiogram, followed by a static image after the radionuclide has perfused the tissue.
In other cases, imaging can be performed by labelling a suitable radionuclide to the same peptide as used for therapy. [22] Radionuclides that can be used for imaging include gallium-68, technetium-99m and fluorine-18. [21] Currently used peptides can result in high kidney doses, as the radiopharmaceutical is retained for relatively long ...
The radiation sensitivity of the liver parenchyma limits the radiation dose that can be delivered via external beam radiotherapy. SIRT, on the other hand, involves the direct insertion of radioactive microspheres to a region, resulting in a local and targeted deposition of radioactive dose. It is therefore well-suited for treatment of liver tumors.
The required decisions include how many radiation beams to use, which angles each will be delivered from, whether attenuating wedges be used, and which MLC configuration will be used to shape the radiation from each beam. Once the treatment planner has made an initial plan, the treatment planning system calculates the required monitor units to ...
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The risk increases with the exposure time, consisting of 1) time guiding the probe into and out of the heart and 2) time illuminating the contrast agent to perform the angiogram. Absorbed radiation is also a function of body mass index, with obese patients having twice the dose of normal-weight patients; exposure to the operator was also ...