Method for magnetic resonance imaging based on partially parallel acquisition (PPA)

摘要

In a method and system for magnetic resonance imaging of an examination subject on the basis of partially parallel acquisition (PPA) with multiple component coils, a calibration measurement is implemented in a first time period and an actual measurement for the imaging is implemented in a subsequent second time period. In the calibration measurement, calibration data for predetermined calibration points in spatial frequency space are acquired with the multiple component coils. In the actual measurement, incomplete data sets are respectively acquired in spatial frequency space with each of the multiple component coils. Complete data sets are reconstructed from the incomplete data sets and the calibration data. The first time period and the second time period are different, and the measurements are implemented when triggered in the two time periods. An essentially identical state of the examination subject or of the measurement system is used as a trigger.

主权项

1. A method for magnetic resonance imaging of a living subject exhibiting a non-temporally constant state, comprising the steps of:
in a first part of a partially parallel acquisition procedure, operating a magnetic resonance data acquisition unit in which the subject is located to implement a single calibration measurement in a first time period in which a single calibration data set is acquired from a region of the subject, comprised of data respectively acquired by multiple data acquisition coils for predetermined calibration points in k-space; in a second part of said partially parallel acquisition procedure, operating said magnetic resonance data acquisition unit with said subject located therein to acquire measurement data from said region of the subject in a second time period that entirely follows a termination of said first time period, said measurement data being acquired respectively by said multiple component coils as respective incomplete data sets in k-space; triggering said second time period when the subject exhibits a state that is identical to the state of the subject in said first time period; and in a computerized processor, reconstructing a complete magnetic resonance image data set from said incomplete data sets and said single calibration data set, and making said complete magnetic resonance image data set available in electronic form at an output of the processor.