QUANTITATIVE MEASUREMENT OF RELAXATION TIMES IN MAGNETIC RESONANCE IMAGING

摘要

The invention provides for a magnetic resonance imaging system (100, 400). Machine executable instructions (140) cause a processor (130) controlling the magnetic resonance imaging system to control (200) the magnetic resonance imaging system with pulse sequence commands to acquire a series of magnetic resonance data and noise magnetic resonance data. The pulse sequence commands are configured for controlling the magnetic resonance imaging system to acquire the series of magnetic resonance data (144) from a subject (118) according to a quantitative magnetic resonance imaging protocol for quantitatively determining a relaxation time. The quantitative magnetic resonance imaging protocol is configured for controlling the magnetic resonance imaging system to acquire the series of the magnetic resonance data using multiple pulse sequence repetitions (508). Each of the multiple pulse sequence repetitions comprises a magnetic gradient portion (502), a radio frequency portion (500), and an acquisition portion (504). The quantitative magnetic resonance imaging protocol comprises a pause cycle (510) between at least two of the multiple pulse sequence repetitions, wherein the pulse sequence commands are configured for acquiring noise magnetic resonance data (146) during the pause cycle using the magnetic gradient portion and the acquisition portion. The radio frequency portion is disabled during the acquisition of the noise magnetic resonance data. Execution of the machine executable instructions further cause the processor to reconstruct (202) a series of magnetic resonance images (148) weighted for the relaxation time using the series of magnetic resonance data and reconstruct (204) a noise magnetic resonance image (150) using the noise magnetic resonance data.