公开(公告)号：US11378637B2

公开(公告)日：2022-07-05

申请号：US17205683

申请日：2021-03-18

Applicant: Hitachi, Ltd.

Inventor： Ayaka Ikegawa ,  Masahiro Takizawa ,  Hisako Nagao ,  Tomohiro Gotou

IPC: G01R33/54 ,  G01R33/56

Abstract: Imaging failure of a positioning image due to the difference in the position or the size of a subject placed in the examination space is prevented, and accordingly, the extension of the examination time is prevented. A pre-scan for appropriately setting the imaging position for positioning imaging is automatically performed prior to the positioning imaging and the main imaging of an MRI apparatus, and a region where an examination part of a subject is present (the extent of the examination part) is detected using the measurement data. By using the detected extent of the examination part, it is possible to subsequently determine the imaging position or calculate the scan parameters used for imaging.

公开(公告)号：US11701024B2

公开(公告)日：2023-07-18

申请号：US16384038

申请日：2019-04-15

Applicant: Hitachi, Ltd.

Inventor： Toru Shirai ,  Suguru Yokosawa ,  Hisako Nagao ,  Yasuhide Yoshida ,  Yasuo Kawata ,  Kuniaki Harada

IPC: A61B5/055 ,  A61B5/00 ,  G06T7/00 ,  G06T15/30 ,  G06T3/00 ,  G01R33/563 ,  G01R33/56 ,  A61B5/02 ,  G06V10/25 ,  G06V20/64

CPC classification number: A61B5/055 ,  A61B5/0042 ,  A61B5/02007 ,  G01R33/5608 ,  G01R33/5635 ,  G06T3/0068 ,  G06T7/0012 ,  G06T15/30 ,  G06V10/25 ,  G06V20/64 ,  G06T2207/10088 ,  G06T2207/20081 ,  G06T2207/20182 ,  G06T2207/30016 ,  G06T2207/30104

Abstract: An automatic clipping technique capable of satisfactorily extracting blood vessels to be extracted is provided. A specific tissue extraction mask image which is created by extracting a specific tissue (for example, a brain) from a three-dimensional image acquired by magnetic resonance angiography and a blood vessel extraction mask image which is created by extracting a blood vessel from an area (a blood vessel search area) which is determined using a preset landmark position and the specific tissue extraction mask image are integrated to create an integrated mask. By applying the integrated mask to the three-dimensional image, a blood vessel is clipped from the three-dimensional image.

公开(公告)号：US11255939B2

公开(公告)日：2022-02-22

申请号：US16889987

申请日：2020-06-02

Applicant: Hitachi, Ltd.

Inventor： Suguru Yokosawa ,  Toru Shirai ,  Hisako Nagao ,  Chikako Moriwake ,  Binrong Wu

IPC: G01R33/56 ,  G01R33/54 ,  A61B5/107 ,  A61B5/055

Abstract: A magnetic resonance imaging (MRI) apparatus performs automatic positioning with high accuracy within a short time with respect to tissues having a complicated anatomic structure. First measurement of scout imaging is executed before main imaging for acquiring a diagnosis image, and one-dimensional or two-dimensional measurement data is acquired. The right and left of a subject is determined by using the measurement data acquired in the first measurement. A cross-section position in second measurement of the scout imaging is calculated by using a determination result in the right and left determination and the measurement data acquired in the first measurement, the second measurement at the cross-section position is executed, and two-dimensional measurement data is acquired. A cross-section position in the main imaging is calculated by using the two-dimensional measurement data acquired in the second measurement.

公开(公告)号：US10564233B2

公开(公告)日：2020-02-18

申请号：US14897066

申请日：2014-06-18

Applicant: HITACHI, LTD.

Inventor： Kenta Sakuragi ,  Hisako Nagao ,  Masaharu Ono

IPC: G01R33/00 ,  G01R33/28 ,  A61B5/055 ,  A61B5/00 ,  G01R33/54 ,  G01R33/58

Abstract: The magnetic resonance imaging apparatus includes: a calculation means for calculating the amount of absorption of electromagnetic waves into the object according to the emission of RF pulses in a part of the object or a bed position where imaging is scheduled; a means for setting imaging conditions, in which the calculated amount of absorption satisfies conditions of the specified value of the amount of absorption of electromagnetic waves, from the relationship between the calculated amount of absorption and the specified value of the amount of absorption of electromagnetic waves; and a bed control device that controls a top plate according to the set imaging conditions.

公开(公告)号：US11701025B2

公开(公告)日：2023-07-18

申请号：US16385104

申请日：2019-04-16

Applicant: Hitachi, Ltd.

Inventor： Suguru Yokosawa ,  Hisaaki Ochi ,  Yoshimi Noguchi ,  Kenta Sakuragi ,  Hisako Nagao ,  Kuniaki Harada

IPC: A61B5/055 ,  G01R33/56 ,  G01R33/483 ,  G06T7/73 ,  A61B5/00

CPC classification number: A61B5/055 ,  A61B5/742 ,  A61B5/7485 ,  G01R33/4833 ,  G01R33/5608 ,  G06T7/74 ,  A61B2576/00 ,  G06T2207/10088 ,  G06T2207/20081 ,  G06T2207/30012

Abstract: An imaging unit of an MRI apparatus performs imaging of a positioning image of a subject including a spine; a first imaging that images a cross section including the spine and extending along a longitudinal direction of the spine; and a second imaging that images a cross section in a direction of traversing the spine. An automatic cross-section position setting unit detects a specific tissue of the spine using a scout image or an image including the spine acquired in the first imaging step, performs a matching process between the detected specific tissue of the spine and a spine model, and calculates an imaging cross-section position of the second imaging based upon a specific tissue position of the spine specified by matching, thereby performing automatic setting.

公开(公告)号：US10338166B2

公开(公告)日：2019-07-02

申请号：US14897056

申请日：2015-01-29

Applicant: HITACHI, LTD.

Inventor： Kenta Sakuragi ,  Hisako Nagao ,  Masaharu Ono

IPC: G01R33/00 ,  G01R33/28 ,  A61B5/055 ,  A61B5/00 ,  G01R33/54 ,  G01R33/58

Abstract: In order to provide a magnetic resonance imaging apparatus capable of calculating the amount of absorption of electromagnetic waves into the object with high accuracy, the magnetic resonance imaging apparatus includes: a calculation means for calculating the amount of absorption of electromagnetic waves into the object upon the emission of RF pulses in a part of the object or a bed position where imaging is scheduled; a means for setting imaging conditions, in which the calculated amount of absorption satisfies conditions of the specified value of the amount of absorption of electromagnetic waves, from the relationship between the calculated amount of absorption and the specified value of the amount of absorption of electromagnetic waves; and a bed control device that controls a top plate according to the set imaging conditions.