Nuclear medicine diagnosis device, form tomography diagnosis device, nuclear medicine data arithmetic processing method, and form tomogram arithmetic processing method

A form tomography diagnosis device obtaining a form tomogram of a subject injected with a radiopharmaceutical based on radiant rays generated from the subject, comprising:

• a radiation detection unit configured to contain an element emitting a plurality of radiant rays simultaneously;
• a blank data collection unit collecting coincidence count data as blank data, the coincidence count data being coincidentally counted by causing the radiation detection unit configured to contain the element to count some of the radiant rays emitted from the element contained in the radiation detection unit and causing another radiation detection unit to count other radiant rays in a state in which the subject is absent;
• a transmission data collection unit collecting coincident count data as transmission data, the coincidence count data being coincidentally counted by causing the radiation detection unit configured to contain the element to count some of the radiant rays emitted from the element contained in the radiation detection unit and another radiation detection unit to count other radiant rays in a state in which the subject is present;
• a perspective image acquisition unit acquiring a perspective image of the subject based on the blank data collected by the blank data collection unit and the transmission data collected by the transmission data collection unit;
• and
• a form tomogram acquisition unit reconstructing the perspective image and acquiring the form tomogram of the subject.

A nuclear medicine data arithmetic processing method of performing an arithmetic processing on nuclear medicine data on a subject injected with a radiopharmaceutical based on radiant rays generated from the subject, comprising the steps of:

• (1) collecting coincidence count data as blank data, the coincidence count data being coincidentally counted by causing a radiation detection unit configured to contain an element emitting a plurality of radiant rays simultaneously to count some of the radiant rays emitted from the element contained in the radiation detection unit and causing another radiation detection unit to count other radiant rays in a state in which the subject is absent;
• (2) collecting coincident count data as transmission data, the coincidence count data being coincidentally counted by causing the radiation detection unit configured to contain the element to count some of the radiant rays emitted from the element contained in the radiation detection unit and another radiation detection unit to count other radiant rays in a state in which the subject is present;
• (3) collecting coincidence count data as emission data, the coincidence count data being coincidentally counted by causing the radiation detection unit to count the radiant rays generated from the subject injected with the radiopharmaceutical;
• (4) calculating absorption-corrected data on the subject based on at least one of the blank data and the transmission data;
• (5) absorption-correcting the emission data using the absorption-corrected data;
• and
• performing the arithmetic processing including the steps (1) to (5) for finally obtaining the absorption-corrected emission data as the nuclear medicine data.

A form tomogram arithmetic processing method of performing an arithmetic processing on a form tomogram of a subject injected with a radiopharmaceutical based on radiant rays generated from the subject, comprising the steps of:

• (1) collecting coincidence count data as blank data, the coincidence count data being coincidentally counted by causing a radiation detection unit configured to contain an element emitting a plurality of radiant rays simultaneously to count some of the radiant rays emitted from the element contained in the radiation detection unit and causing another radiation detection unit to count other radiant rays in a state in which the subject is absent;
• (2) collecting coincident count data as transmission data, the coincidence count data being coincidentally counted by causing the radiation detection unit configured to contain the element to count some of the radiant rays emitted from the element contained in the radiation detection unit and another radiation detection unit to count other radiant rays in a state in which the subject is present;
• (6) acquiring a perspective image of the subject based on the blank data and the transmission data;
• and
• performing the arithmetic processing including the steps (1), (2), and (6) for reconstructing the perspective image and obtaining the form tomogram of the subject.