Magnetic resonance imaging apparatus and magnetic resonance imaging method

• US 9,591,988 B2
• Filed: 11/02/2011
• Issued: 03/14/2017
• Est. Priority Date: 11/02/2010
• Status: Active Grant

• Current Assignee: Toshiba Medical Systems Corporation (Canon Inc.)
• Original Assignee: Toshiba Medical Systems Corporation (Canon Inc.)
• Inventors: Takeguchi, Tomoyuki, Kuhara, Shigehide, Nitta, Shuhei, Matsumoto, Nobuyuki
• Primary Examiner(s): Le, Long V
• Assistant Examiner(s): Sakamoto, Colin T
• Application Number:
  US13/287,268
• Publication Number:
  US 20120108946A1
• Time in Patent Office: 1,959 Days
• US Class Current: 1/1
• CPC Class Codes: A61B 5/0037 Performing a preliminary scan, e.g. a prescan for identifying a region of interest
• CPC Class Codes: A61B 5/0044 for the heart
• CPC Class Codes: A61B 5/055 involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• CPC Class Codes: A61B 5/352 Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
• CPC Class Codes: G01R 33/385 using gradient magnetic field coils
• CPC Class Codes: G01R 33/4833 using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices
• CPC Class Codes: G01R 33/543 Control of the operation of the MR system, e.g. setting of acquisition parameters prior to or during MR data acquisition, dynamic shimming, use of one or more scout images for scan plane prescription G01R33/546 takes precedence
• 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

Abstract

According to one embodiment, a MRI apparatus includes an acquisition unit, a reference section information calculating unit, a positioning unit and an imaging unit. The acquisition unit acquires frames of section image data including a heart from an object with use of magnetic resonance. The reference section information calculating unit calculates spatial positional information of a reference section of the heart based on the frames of the section image data. The positioning unit displays a reference section image of the heart on a display unit and performs positioning of an imaging part for imaging through the displayed reference section image of the heart. The reference section image is calculated from the frames of the section image data based on the positional information of the reference section. The imaging unit images the imaging part set by the positioning.

Claims

1. A magnetic resonance imaging (MRI) apparatus comprising:

a static magnetic field generator;

gradient magnetic field coils;

at least one radio frequency coil;

a display; and

a control system including at least one control computer coupled to control said display, said gradient magnetic field coils, and said at least one radio frequency coil, said control computer being configured to;

control said gradient magnetic field coils and said at least one radio frequency coil to acquire volume image data including a heart from an object;

automatically calculate spatial-positional locations of pre-determined anatomical features of the heart based on the acquired volume image data;

automatically generate a reference section image of the heart by;

generating a reference section of the heart at a spatial-positional location corresponding to the calculated spatial-positional locations of pre-determined anatomical features of the heart,

identifying, from the acquired volume image data, imaging data with spatial-positional locations that correspond to the spatial-positional location of the reference section, and

generating the reference section image of the heart by forming the identified imaging data into an image;

control the display to display the generated reference section image of the heart;

set a position of an imaging plane for subsequent cardiac imaging corresponding to a position of the displayed reference section image of the heart; and

control said gradient magnetic field coils and said at least one radio frequency coil to acquire a cardiac image of the set imaging plane within the heart of said object.

2. The magnetic resonance imaging apparatus of claim 1,

wherein said control computer is configured to calculate the spatial-positional location of pre-determined anatomical features by automatically detecting the spatial-positional locations of pre-determined anatomical features by

a first automated process based on the acquired volume image data and pre-stored anatomical knowledge data, and then by

a second automated process based on detection accuracy of the positional information of the reference section achieved by the first process and at least one of pre-stored anatomical knowledge and frames of cardiac feature image data of hearts from other objects.

3. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to generate the reference section by:

generating picks for positions of the reference section,

automatically narrowing down the picks by referring to reference data generated from at least one of (a) pre-stored anatomical knowledge data and (b) frames of cardiac feature image data of the hearts from other objects, and

automatically specifying the position of the reference section based on the acquired volume image data by signal processing based on pre-stored anatomical knowledge data after automatically narrowing down the picks.

4. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to calculate the spatial-positional location of pre-determined anatomical features based on the acquired volume image data by automatically detecting the spatial-positional locations of pre-determined anatomical features by

a first process including signal processing based on pre-stored anatomical knowledge data, or

a second process referring to pre-stored reference data generated from at least one of (a) pre-stored anatomical knowledge data and (b) cardiac feature image data of hearts from other objects.

5. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to calculate the spatial-positional location of pre-determined anatomical features based on the acquired volume image data by

calculating the spatial-positional locations of pre-determined anatomical features as vector information.

6. The magnetic resonance imaging apparatus of claim 1, further comprising a manually operated input device for selecting a thumbnail image, wherein the control computer is configured to:

automatically generate different and display different reference section images of the heart as thumbnails by;

generating different reference sections of the heart at different spatial-positional locations corresponding to the calculated spatial-positional locations,

identifying, from the acquired volume image data, different imaging data with different spatial-positional locations that correspond to the different spatial-positional locations of the reference section,

generating the different reference section images of the heart as thumbnails by forming the identified different imaging data into different images, and

controlling the display to display the different reference section images as thumbnail images;

receive a selection of one of the displayed thumbnails from the manually operated input device; and

set a data acquisition pulse sequence to acquire magnetic resonance data for subsequent cardiac imaging in accordance with the position of the reference section image of the heart corresponding to a selected thumbnail.

7. The magnetic resonance imaging apparatus of claim 1, further comprising a manual input device configured to input information relating to an imaging protocol, wherein the control computer is configured to:

automatically generate and display different reference section images by;

generating different reference sections of the heart at different spatial-positional locations corresponding to the calculated spatial-positional locations,

identifying, from the acquired volume image data, different imaging data with different spatial-positional locations that correspond to the different spatial-positional locations of the reference section,

generating the different reference section images of the heart as thumbnails by forming the identified different imaging data into different images, and

controlling the display to display the different reference section images; and

display a condition on at least one other reference section image indicating a slice to be a target of subsequent cardiac imaging, when information, relating to one of the reference section images with an imaging protocol, is manually inputted from the manual input device.

8. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is further configured:

to add information, identifying the reference section image used for setting the position of the imaging plane, to the acquired cardiac image as sorting information for the acquired cardiac image.

9. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to automatically generate at least three different reference sections of the heart at respectively different spatial-positional locations corresponding to the calculated spatial-positional locations of pre-determined anatomical features of the heart.

10. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to automatically calculate the spatial-positional locations of the pre-determined anatomical features by

generating at least three views of the heart using the acquired volume image data, the at least three views selected from the group consisting of (a) a vertical long-axis view,(b) a horizontal long-axis view, (c) a four chamber long-axis view, (d) a three chamber long-axis view,(e) a two chamber long-axis view and (f) a left ventricle short-axis view, and

using the generated at least three views of the heart to calculate the spatial-positional locations of the pre-determined anatomical features.

11. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to automatically calculate the spatial-positional locations of pre-determined anatomical features by

generating isotropic volume data by preprocessing the acquired volume image data to transform the acquired volume image data into the isotropic data, and

calculating the spatial-positional locations of pre-determined anatomical features based on the generated isotropic volume data.

12. The magnetic resonance imaging apparatus of claim 1, further comprising:

a manually operated input device configured to receive a manually inputted instruction to adjust the reference section image displayed on the display into an arbitrary direction,

wherein said control computer is further configured to automatically update the reference section image displayed on the display based on the received manually inputted instruction, when the instruction is manually inputted from the manually operated input device by

moving the reference section in the arbitrary direction,

identifying, from the acquired volume image data, imaging data with spatial-positional locations that correspond to the spatial-positional location of the moved reference section,

generating an updated reference section image by forming the identified imaging data into an image, and

controlling the display to display the generated updated reference section image.

13. The magnetic resonance imaging apparatus of claim 10, wherein said control computer is further configured to

control the display to display an anatomically characterized part of the heart together with the reference section images,

receive a manually inputted instruction to move the characterized part, and

automatically update the reference section images in conjunction with movement of the characterized part when the instruction to move the characterized part is received by

moving the reference section in conjunction with movement of the characterized part,

identifying, from the acquired volume image data, imaging data with spatial-positional locations that correspond to the spatial-positional location of the moved reference section,

generating an updated reference section image by forming the identified imaging data into an image, and

controlling the display to display the generated updated reference section image.

14. The magnetic resonance imaging apparatus of claim 11, wherein said control computer is further configured to control the display to display at least one of an apex cordis, a mitral valve, a long axis and a center of a left ventricle as an anatomically characterized part.

15. The magnetic resonance imaging apparatus of claim 1, further comprising an electrocardiogram generator providing an electrocardiogram,

wherein said control computer is configured to control said gradient magnetic field coils and said at least one radio frequency coil to acquire said volume image data by a single shot magnetic resonance imaging sequence synchronized with the electrocardiogram.

16. The magnetic resonance imaging apparatus of claim 1, further comprising an electrocardiogram generator providing an electrocardiogram,

wherein said control computer is configured to control said gradient magnetic field coils and said at least one radio frequency coil to acquire the volume image data as a plurality of frames of section image data by acquiring one frame of section image data between adjacent two or three reference waves of the electrocardiogram.

17. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to control said gradient magnetic field coils and said at least one radio frequency coil to acquire said volume image data by acquiring said volume image data at same cardiac time phases of multiple cardiac cycles.

18. The magnetic resonance imaging apparatus of claim 1, further comprising an electrocardiogram generator providing an electrocardiogram,

wherein said control computer is configured to control said gradient magnetic field coils and said at least one radio frequency coil to acquire said volume image data by acquiring said volume image data at constant delay times of multiple cardiac cycles relative reference waves of the electrocardiogram.

19. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to control said gradient magnetic field coils and said at least one radio frequency coil to acquire said volume image data by acquiring said volume image data during static periods of systoles or static periods of diastoles of the heart.

20. The magnetic resonance imaging apparatus of claim 1, wherein the control computer is configured to:

control said gradient magnetic field coils and said at least one radio frequency coil to acquire said volume image data by acquiring first and second sets of said volume image data during static periods of systoles and static periods of diastoles of the heart respectively;

calculate spatial-positional locations of pre-determined anatomical features based on the acquired volume image data by;

automatically calculating first spatial-positional locations of pre-determined anatomical features based on the acquired first set of volume image data corresponding to static periods of systoles, and

automatically calculating second spatial-positional locations of pre-determined anatomical features based on the acquired second set of volume image data corresponding to static periods of diastoles; and

generate the reference section of the heart by generating first and second reference sections of the heart by;

automatically calculating spatial positional information of the first reference section of the heart based on the calculated first spatial-positional locations of pre-determined anatomical features, and

automatically calculating spatial positional information of the second reference section of the heart based on the calculated second spatial-positional locations of pre-determined anatomical features.

21. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to:

automatically calculate spatial-positional locations of pre-determined anatomical features of the heart based on the acquired volume image data by calculating spatial-positional locations of a long-axis connecting a tip of a mitral valve with an apex cordis; and

generate the reference section of the heart at a spatial-positional location corresponding to the calculated spatial-positional locations of pre-determined anatomical features of the heart by;

automatically calculating spatial-positional information of a section of a left ventricle short-axis view based on the calculated spatial-positional locations of the long-axis connecting a tip of a mitral valve with an apex cordis, and

automatically calculating spatial-positional information for at least one section of a four chamber long-axis view, a three chamber long-axis view, and a two chamber long-axis view as said reference section of the heart based on the calculated spatial-positional information of the section of the left ventricle short-axis view.

22. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to:

automatically calculate spatial-positional locations of pre-determined anatomical features of the heart based on the acquired volume image data by calculating spatial-positional locations of a long-axis connecting a tip of a mitral valve with an apex cordis; and

generate the reference section of the heart at a spatial-positional location corresponding to the calculated spatial-positional locations of pre-determined anatomical features of the heart by;

automatically calculating spatial-positional information of a section of a left ventricle short-axis view based on the calculated spatial-positional locations of the long-axis connecting a tip of a mitral valve with an apex cordis, and

automatically calculating spatial-positional information for sections of a four chamber long-axis view, a two chamber long-axis view, and a three chamber long-axis view in a sequential order as said reference section of the heart based on the calculated spatial-positional information of the section of the left ventricle short-axis view.

23. The magnetic resonance imaging apparatus of claim 1, wherein said control computer is configured to:

automatically calculate spatial-positional locations of pre-determined anatomical features of the heart based on the acquired volume image data by;

calculating spatial-positional locations of a right ventricle in case of functional evaluation of the right ventricle, and

calculating spatial-positional locations of a valve in case of a functional evaluation of the valve; and

generate the reference section of the heart at a spatial-positional location corresponding to the calculated spatial-positional locations of pre-determined anatomical features of the heart by;

automatically calculating spatial-positional information for a reference section consisting of a section crossing the right ventricle, based on the calculated spatial-positional locations of the right ventricle, as said reference section of the heart in the case of functional evaluation of the right ventricle, and

automatically calculating spatial-positional information of a reference section consisting of a section passing through the valve, based on the calculated spatial-positional locations of the valve, as said reference section in the case of functional evaluation of the valve.

24. The magnetic resonance imaging apparatus of claim 1, wherein:

the control computer is configured to control said gradient magnetic field coils and said at least one radio frequency coil to acquire the volume image data by acquiring frames of section image data as the volume image data.

25. The magnetic resonance imaging apparatus of claim 1, further comprising:

an electrocardiogram generator providing an electrocardiogram,

wherein the control computer is configured to control said gradient magnetic field coils and said at least one radio frequency coil to acquire the volume image data by acquiring the volume image data in synchronization with the electrocardiogram.

26. A magnetic resonance imaging (MRI) apparatus as in claim 1 wherein the control computer is configured to:

generate a plurality of reference section images of the heart in different directions based on the volume image data by;

generating a plurality of reference sections in the different directions based on the volume image data,

identifying, from the acquired volume image data, a plurality of imaging data with spatial-positional locations that correspond to the spatial-positional locations of the plurality of reference sections respectively, and

generating the plurality of reference section images of the heart by forming the identified plurality of imaging data into a plurality of images;

control the display to display the generated plurality of reference section images of the heart in different directions;

set a position of another imaging plane for subsequent cardiac imaging based on positions of the displayed plurality of reference section images of the heart in different directions; and

control said gradient magnetic field coils and said at least one radio frequency coils to acquire a cardiac image of said another imaging plane within the heart of said object.

27. A magnetic resonance imaging (MRI) control apparatus comprising:

at least one computer configured to;

control gradient magnetic field coils and at least one radio frequency coil of a magnetic resonance imaging apparatus to acquire volume image data including a heart of an object;

automatically detect a position of at least one anatomical part of the heart based on the acquired volume image data;

automatically calculate a position of at least one reference section of the heart, based on the automatically detected anatomical part of the heart;

automatically generate at least one reference section image of the heart by;

identifying, from the acquired volume image data, imaging data with positions that correspond to the position of the at least one reference section, and

generating the at least one reference section image of the heart by forming the identified imaging data into at least one image;

control a display of said magnetic resonance imaging apparatus to display said at least one reference section image of the heart;

set at least one imaging plane for imaging corresponding to a position of the displayed at least one reference section image of the heart; and

control said gradient magnetic field coils and said at lest one radio frequency coil of said magnetic resonance imaging apparatus to subsequently acquire at least one cardiac image of the at least one imaging plane within the heart.

28. The magnetic resonance imaging apparatus of claim 27, wherein the at least one computer is configured with reference image section kind presets which allow a kind of the displayed reference section image to be preset.

29. The magnetic resonance imaging apparatus of claim 27, wherein the at least one computer is configured to:

store library data representing a determination reference, for specifying the anatomical part, as a combination of parameters; and

detect the position of the at least one anatomical part of the heart further based on the stored library data.

30. A magnetic resonance imaging (MRI) control apparatus comprising:

at least one computer configured to;

control gradient magnetic field coils and at least one radio frequency coil of a magnetic resonance imaging apparatus to acquire volume image data including a heart of an object;

automatically calculate a position of at least one reference section of a heart based on the acquired volume image data;

automatically generate at least one reference section image of the heart by;

identifying, from the acquired volume image data, imaging data with positions that correspond to the position of the at least one reference section, and

generating the at least one reference section image of the heart by forming the identified imaging data into at least one image;

control a display of said magnetic resonance imaging apparatus to display said at least one reference section image of the heart;

set an imaging plane for imaging corresponding to a position of the displayed reference section image of the heart;

control said gradient magnetic field coils and said at least one radio frequency coil of said magnetic resonance imaging apparatus to subsequently acquire at least one cardiac image of the imaging plane within the heart;

receive, from an input device, a manually inputted instruction to update the displayed reference section image; and

update the displayed reference section image, based on the received instruction.

31. A magnetic resonance imaging (MRI) method comprising:

acquiring volume image data including a heart from an object;

automatically calculating spatial-positional locations of pre-determined anatomical features of the heart based only on the acquired volume image data;

automatically calculating spatial-positional locations of a reference section of the heart based on the calculated spatial-positional locations of the pre-determined anatomical features of the heart;

generating a reference section image of the heart by;

identifying, from the acquired volume image data, imaging data with spatial-positional locations that correspond to the spatial-positional locations of the reference section, and

generating the reference section image of the heart by forming the identified imaging data into an image;

displaying the reference section image of the heart on a display;

setting a position of an imaging plane for imaging corresponding to a position of the displayed reference section image of the heart; and

subsequently acquiring an MR cardiac image of the imaging plane within the heart.

32. A magnetic resonance imaging (MRI) method as in claim 31 wherein:

a plurality of reference section images of the heart are generated in different directions based on the volume image data by;

generating a plurality of reference sections in the different directions based on the volume image data,

identifying, from the acquired volume image data, a plurality of imaging data with spatial-positional locations that correspond to the spatial-positional locations of the plurality of reference sections respectively, and

generating the plurality of reference section images of the heart by forming the identified plurality of imaging data into a plurality of images;

the generated plurality of reference section images of the heart in different directions are displayed on a display;

the position of another imaging plane for subsequent cardiac imaging is set based on positions of the displayed plurality of reference section images of the heart in different directions; and

a cardiac image of said another imaging plane within the heart of said object is acquired.