Patent Number: 6,490,337

Title: X-ray CT apparatus

Abstract: Before a CT scan for a patient, a model that shows transmission lengths ofthe patient at rotation angles of an X-ray source is stored in a memory.At the CT scan, X-ray tube currents are controlled according to thetransmission lengths at the rotation angles in order to apply X-rays tothe patient. The three-dimensional model is homogenous and its material issimilar to that of the patient's body, and transmission lengths of thethree-dimensional model are converted into those of the patient. The modelis acquired by a scannography in a single direction or a CT helicalscanning with a small X-ray dose. This reduces the X-ray dose applied tothe patient.

Inventors: Nagaoka; Takayuki (Sakura, JP), Miyazaki; Osamu (Ibaraki, JP)


International Classification: A61B 6/03 (20060101); A61B 006/00 ()

Expiration Date: 12/02015