Which of the following radiopharmaceuticals is NOT light sensitive?

The correct answer is based on the properties of radiopharmaceuticals and their sensitivity to light. MAA, or Macroaggregated Albumin, is a radiopharmaceutical used primarily in lung perfusion imaging and is not light sensitive. This characteristic allows MAA to be stored and handled without the strict light protection that some other radiopharmaceuticals require.

In contrast, DMSA and MAG3 are both known to be light sensitive. DMSA (Dimercaptosuccinic acid) is commonly used for renal imaging and must be protected from light to prevent degradation. Similarly, MAG3 (Mercaptoacetyltriglycine), which is also utilized for renal function studies and assessment of renal perfusion, requires protection from light as well. The degradation caused by light exposure can alter their efficacy and reliability in imaging, which is why they must be stored in dark conditions or in light-blocking containers.

Thus, identifying MAA as not being light sensitive is crucial as it highlights its unique handling requirements compared to DMSA and MAG3, impacting both its preparation and usage in clinical settings.