Nucleolab

 

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99mTc-MAA dosage

 

In doses of 99mTc-MAA (macroaggregated albumin), a sufficient number of particles needs to be administered to avoid a nonuniform distribution of radioactivity in the lung. On the other hand, toxicity can occur from the administration of too many particles for lung scans. Consequently, calculations related to the preparation and withdrawal of 99mTc-MAA are important. After labelling, the concentration of particles of 99mTc-MAA remains constant, but activity decays with time; these calculations should therefore take into account the decay process at any time. These calculations can be performed quickly and reliably using the 99mTc-MAA dosage module, which consists of three screens.

 

The vial labeling screen calculates the volume and activity that should be added to a vial of MAA for labeling, depending on the number of particles and the activity of a dose of 99mTc-MAA. The following data are entered: dose activity, dose volume, number of particles in the dose, number of particles in the vial, and time between labeling and withdrawal of the dose.

 

 

The dose dispensation screen calculates the dose volume and dose activity when the following data are entered: labeling activity, labeling volume, number of particles in the dose, number of particles in the vial, and time between labeling and withdrawal of the dose.

 

 

The particle number screen calculates the volume and the number of particles in the dose when the following data are entered: labeling activity, labeling volume, dose activity, number of particles in the vial, and time between labeling and withdrawal of the dose.

 

 

 

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