Systems and methods for registering radionuclide information

A method for registering radionuclide information, implemented on a computing device having at least one processor and at least one storage device, the method comprising:

• controlling an emission computer tomography (ECT) scanner to perform an ECT scan on a subject including a target radionuclide to obtain photon energy information of a target radionuclide;
• determining, based on the photon energy information, an energy spectrum curve;
• presenting the energy spectrum curve to a user;
• obtaining target values of one or more spectral feature parameters of the target radionuclide corresponding to the energy spectrum curve;
• and
• registering the target values of the one or more spectral feature parameters of the target radionuclide into the radionuclide library of the ECT scanner.

A method for emission computer tomography (ECT) scan, implemented on a computing device having at least one processor and at least one storage device, the method comprising:

• controlling an ECT scanner to perform an ECT scan on a subject including a target radionuclide, wherein the ECT scan includes a first scan period and a second scan period, and the first scan period is earlier than the second scan period;
• obtaining, based on scan data collected during the first scan period, target values of one or more spectral feature parameters of the target radionuclide;
• and
• reconstructing an ECT image of the subject based on the target values of one or more spectral feature parameters of the target radionuclide and scan data collected the second scan period.