FIELD: medicine.
SUBSTANCE: group of inventions relates to medical equipment, specifically to means for magnetic resonance imaging of pressure of acoustic radiation (MR-AFRI). Device comprises a high-intensity focused ultrasound system and a magnetic resonance imaging system for collecting magnetic resonance data from a visualization region, wherein the sonic region and the visualization region are at least partially matched, a control processor, memory for storing machine-executable instructions of the pulse sequence for controlling the magnetic resonance imaging system in accordance with the acoustic radiation pressure imaging protocol, first sonication commands for controlling a high-intensity focused ultrasound system to effect sonication in the sonication region in accordance with the acoustic radiation pressure visualization protocol, second sonication commands for controlling a high-intensity focused ultrasound system to ultrasound the sonication region in accordance with the acoustic radiation pressure visualization protocol, wherein the pulse sequence instructions set the magnetic resonance data collection during the pulse sequence repetitions, setting the first group of motion encoding gradients and the second motion encoding grades for each of the multiple repetitions of the sequence, wherein the first and second groups of motion encoding gradients are transmitted with the same polarity, wherein execution of machine-executable instructions instructs the processor: collecting the first magnetic resonance data by controlling the magnetic resonance imaging system by pulse sequence instructions and by controlling the high-intensity focused ultrasound system by the first sonication commands, wherein the first sonication commands instruct the high-intensity focused ultrasound system to sonically affect the sonication region during the first group of motion encoding gradients; collecting second magnetic resonance data by controlling the magnetic resonance imaging system by pulse sequence commands and by controlling the high-intensity focused ultrasound system by second sonication commands, wherein the second sonication commands instruct the high-intensity focused ultrasound system to effect ultrasound on the sonication region during the second group of motion encoding gradients and to introduce different inclusion delay for the first and second sonication commands; reconstruct a first motion-coding picture from first magnetic resonance data; reconstruct a second motion-coded image from second magnetic resonance data and construct a displacement map based on the difference between the first motion-coded picture and the second motion-coded picture. Device is equipped with a machine-readable carrier and performs a control method.
EFFECT: use of inventions makes it possible to achieve optimization of heating efficiency in the area of interest.
13 cl, 26 dwg
