Magnetic resonance imaging apparatus and method

• US 10,595,725 B2
• Filed: 05/11/2017
• Issued: 03/24/2020
• Est. Priority Date: 04/04/2012
• Status: Active Grant

• Current Assignee: Canon Medical Systems Corporation (Canon Inc.)
• Original Assignee: Canon Medical Systems Corporation (Canon Inc.)
• Inventors: Miyazaki, Mitsue, Yamashita, Yuichi
• Primary Examiner(s): Fujita, Katrina R
• Application Number:
  US15/592,472
• Publication Number:
  US 20170248671A1
• Time in Patent Office: 1,048 Days
• CPC Class Codes: A61B 2576/026 for the brain
• CPC Class Codes: A61B 5/00 Measuring for diagnostic purposes radiation diagnosis A61B6/00; diagnosis by ultrasonic, sonic or infrasonic waves A61B8/00; Identification of persons
• CPC Class Codes: A61B 5/0042 for the brain
• CPC Class Codes: A61B 5/055 involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• CPC Class Codes: A61B 5/7285 for synchronising or triggering a physiological measurement or image acquisition with a physiological event or waveform, e.g. an ECG signal A61B6/5205, A61B6/541, A61B8/5207, A61B8/543 take precedence
• CPC Class Codes: G01R 33/307 specially adapted for moving the sample relative to the MR system, e.g. spinning mechanisms, flow cells or means for positioning the sample inside a spectrometer
• CPC Class Codes: G01R 33/385 using gradient magnetic field coils
• CPC Class Codes: G01R 33/4818 MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space
• CPC Class Codes: G01R 33/5614 using a fully balanced steady-state free precession [bSSFP] pulse sequence, e.g. trueFISP
• CPC Class Codes: G01R 33/56333 Involving spatial modulation of the magnetization within an imaged region, e.g. spatial modulation of magnetization [SPAMM] tagging perfusion imaging based on arterial spin tagging G01R33/56366
• CPC Class Codes: G01R 33/5673 Gating or triggering based on a physiological signal other than an MR signal, e.g. ECG gating or motion monitoring using optical systems for monitoring the motion of a fiducial marker
• CPC Class Codes: G06T 11/60 Editing figures and text; Combining figures or text
• CPC Class Codes: G06T 2207/10088 Magnetic resonance imaging [MRI]
• CPC Class Codes: G06T 2207/30016 Brain
• CPC Class Codes: G06T 7/0012 Biomedical image inspection
• CPC Class Codes: G06T 7/11 Region-based segmentation
• CPC Class Codes: G16H 30/40 for processing medical images, e.g. editing

Abstract

A magnetic resonance imaging apparatus according to an embodiment includes a collection unit and a generation unit. The collection unit collects data of an imaging area over a plurality of time phases within a certain respiratory cycle after applying a labeling pulse to a labeling area in which cerebrospinal fluid flows under a task of respiration. The generation unit generates images of a plurality of time phases depicting the cerebrospinal fluid by using the collected data.

Claims

1. A magnetic resonance imaging apparatus comprising:

processing circuitry configured to

collect data of an imaging area of a subject over a plurality of time phases within a certain respiratory cycle of the subject after applying a labeling pulse to a labeling area in which cerebrospinal fluid flows under a task of respiration; and

generate images of a plurality of time phases depicting the cerebrospinal fluid by using collected data, wherein

the processing circuitry collects first data in a low frequency region of a k-space over the time phases within a first respiratory cycle and collects second data in a high frequency region of the k-space over the time phases within a second respiratory cycle that is different from the first respiratory cycle, wherein the first respiratory cycle and the second respiratory cycle are periods in which respiration of the subject fluctuates in accordance with the task of respiration; and

the processing circuitry generates the images of the time phases by combining the first data in the low frequency region collected within the first respiratory cycle and the second data in the high frequency region collected within the second respiratory cycle.

2. A magnetic resonance imaging apparatus comprising:

processing circuitry configured to

collect data of an imaging area of a subject over a plurality of time phases within a certain respiratory cycle of the subject after applying a labeling pulse to a labeling area in which cerebrospinal fluid flows under a task of respiration; and

generate images of a plurality of time phases depicting the cerebrospinal fluid by using collected data, wherein

the processing circuitry collects first data of the entire k-space for one time phase within a first respiratory cycle and collects second data in a low frequency region of the k-space over the time phases within a second respiratory cycle that is different from the first respiratory cycle, wherein the first respiratory cycle and the second respiratory cycle are periods in which respiration of the subject fluctuates in accordance with the task of respiration; and

the processing circuitry generates the images of the time phases by combining data in a high frequency region included in the first data of the entire k-space for one time phase collected within the first respiratory cycle and the second data in the low frequency region in each time phase collected within the second respiratory cycle.

3. A magnetic resonance imaging apparatus comprising:

processing circuitry configured to

collect data of an imaging area of a subject over a plurality of time phases within a certain respiratory cycle of the subject after applying a labeling pulse to a labeling area in which cerebrospinal fluid flows under a task of respiration; and

generate images of a plurality of time phases depicting the cerebrospinal fluid by using collected data, wherein

the processing circuitry collects first data in a low frequency region of a k-space over the time phases within a first respiratory cycle and collects second data in a high frequency region of the k-space for one time phase within a second respiratory cycle that is different from the first respiratory cycle, wherein the first respiratory cycle and the second respiratory cycle are periods in which respiration of the subject fluctuates in accordance with the task of respiration; and

the processing circuitry generates the images of the time phases by combining the first data in the low frequency region in each time phase collected within the first respiratory cycle and the second data in the high frequency region for one time phase collected within the second respiratory cycle.