Apparatus for radioimaging a body or a tissue of a human, comprising: a container containing at least one radiopharmaceutical; a computer-communicatable data carrier associated with the container, the data carrier containing data regarding at least one of: the radiopharmaceutical and the patient; and a SPECT imaging system comprising: a communication element, configured to read the data; and a control unit, configured to utilize the read data to customize administration of the radiopharmaceutical and acquisition of a SPECT image of the patient to whom the radiopharmaceutical is administered wherein said administration comprises administering to a human subject a low dose of a first radiopharmaceutical containing at least one of Tc99m between 2-12 mCi, T1-201 between 0.1 and 1 mCi and I-123 between 2 and 4 mCi, and wherein said acquisition comprises acquiring data representing a distribution of said first radiopharmaceutical in at least a section of the body of said subject during at least one short time window which is not greater than about 6 minutes, wherein said imaging system comprises: (i) at least one collimated radioactive-emission detector designed and constructed to image radioactive emission from the said tissue or body; (ii) a position-tracking device communicating with said at least one radioactive-emission detector and configured to provide positional information for said at least one radioactive-emission detector; and (iii) a data processor, designed and configured for receiving data inputs from said position tracking device and said at least one radioactive-emission detector, and for generating an image of the tissue or body, wherein said customization includes customizing the SPECT imaging system. a container containing at least one radiopharmaceutical; a computer-communicatable data carrier associated with the container, the data carrier containing data regarding at least one of: the radiopharmaceutical and the patient; and a SPECT imaging system comprising: a communication element, configured to read the data; and a control unit, configured to utilize the read data to customize administration of the radiopharmaceutical and acquisition of a SPECT image of the patient to whom the radiopharmaceutical is administered wherein said administration comprises administering to a human subject a low dose of a first radiopharmaceutical containing at least one of Tc99m between 2-12 mCi, T1-201 between 0.1 and 1 mCi and I-123 between 2 and 4 mCi, and wherein said acquisition comprises acquiring data representing a distribution of said first radiopharmaceutical in at least a section of the body of said subject during at least one short time window which is not greater than about 6 minutes, wherein said imaging system comprises: (i) at least one collimated radioactive-emission detector designed and constructed to image radioactive emission from the said tissue or body; (ii) a position-tracking device communicating with said at least one radioactive-emission detector and configured to provide positional information for said at least one radioactive-emission detector; and (iii) a data processor, designed and configured for receiving data inputs from said position tracking device and said at least one radioactive-emission detector, and for generating an image of the tissue or body, wherein said customization includes customizing the SPECT imaging system. a communication element, configured to read the data; and a control unit, configured to utilize the read data to customize administration of the radiopharmaceutical and acquisition of a SPECT image of the patient to whom the radiopharmaceutical is administered wherein said administration comprises administering to a human subject a low dose of a first radiopharmaceutical containing at least one of Tc99m between 2-12 mCi, T1-201 between 0.1 and 1 mCi and I-123 between 2 and 4 mCi, and wherein said acquisition comprises acquiring data representing a distribution of said first radiopharmaceutical in at least a section of the body of said subject during at least one short time window which is not greater than about 6 minutes, wherein said imaging system comprises: (i) at least one collimated radioactive-emission detector designed and constructed to image radioactive emission from the said tissue or body; (ii) a position-tracking device communicating with said at least one radioactive-emission detector and configured to provide positional information for said at least one radioactive-emission detector; and (iii) a data processor, designed and configured for receiving data inputs from said position tracking device and said at least one radioactive-emission detector, and for generating an image of the tissue or body, (i) at least one collimated radioactive-emission detector designed and constructed to image radioactive emission from the said tissue or body; (ii) a position-tracking device communicating with said at least one radioactive-emission detector and configured to provide positional information for said at least one radioactive-emission detector; and (iii) a data processor, designed and configured for receiving data inputs from said position tracking device and said at least one radioactive-emission detector, and for generating an image of the tissue or body, wherein said customization includes customizing the SPECT imaging system.