MAGNETIC RESONANCE IMAGING DEVICE AND IMAGING PARAMETER DETERMINATION METHOD

摘要

Provided is a technique capable of achieving safety and image quality at the same time in an MRI device using a transmission coil including plural channels. An SAR distribution is calculated, and an imaging parameter is determined for optimizing a radio frequency magnetic field distribution in an imaging region while suppressing a maximum value of an SAR to be equal to or smaller than a predetermined threshold value. The determined imaging parameter includes a radio frequency magnetic field parameter for specifying radio frequency pulses to be transmitted through each of the plural channels. The SAR distribution is calculated using a database that retains an electric field distribution of each of the plural channels for each subject model retained in advance.

主权项

1. A magnetic resonance imaging device comprising:
a transmission coil that includes a plurality of channels that respectively transmits radio frequency pulses to a subject; an imaging parameter determiner that determines a predetermined imaging parameter among imaging conditions used in imaging the subject; and an imaging unit that executes imaging using the determined imaging parameter, wherein the imaging parameter determiner includes a database that retains data capable of calculating a specific absorption rate distribution for each of predetermined subject models, and an imaging parameter optimizer that determines the imaging parameter for optimizing a radio frequency magnetic field distribution in a region of interest while suppressing a maximum value of a local specific absorption rate to be equal to or smaller than a specific absorption rate threshold value using the data in the database, and wherein the imaging parameter determined by the imaging parameter optimizer includes a radio frequency magnetic field parameter for specifying the radio frequency pulses to be transmitted through each of the plurality of channels.