Patents by Inventor Yasuhiro Kamada
Yasuhiro Kamada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11686801Abstract: During obtaining a sensitivity distribution in a k-space, data based on which the sensitivity distribution is obtained is expanded with a mirror image to create an expanded image to prevent spectrum leakage, and the sensitivity distribution is stably calculated. During obtaining the sensitivity distribution in the k-space, image data based on which the sensitivity distribution is obtained is inverted as a mirror image to be made into the expanded image, the expanded image is transformed into k-space data, and a frequency component (frequency space data) of the sensitivity distribution is calculated. A region corresponding to the original image data is clipped from the calculated frequency space data, and the sensitivity distribution is obtained.Type: GrantFiled: April 28, 2022Date of Patent: June 27, 2023Assignee: FUJIFILM Healthcare CorporationInventors: Shinji Kurokawa, Yasuhiro Kamada, Toru Shirai, Takenori Murase, Hiroki Shoji
-
Patent number: 11579231Abstract: To provide a technique in which, in imaging using an EPI method, an occurrence of an artifact when phase correction is performed for each channel is avoided and the phase correction is accurately performed. A common phase correction value to be applied to data of all channels is calculated using pre-scan data of each channel. The common phase correction value is obtained by combining a difference phase obtained for each of the channels. The difference phase is obtained by complex integration, while an absolute value of each channel is maintained as it is. The combination is performed by complex average, and averaging processing according to a weight of the absolute value is performed. The occurrence of an artifact can be prevented by using the common phase correction value, and robust phase correction can be performed by including the weight of the absolute value.Type: GrantFiled: December 20, 2021Date of Patent: February 14, 2023Assignee: FUJIFILM Healthcare CorporationInventors: Ryota Satoh, Keisuke Nishio, Yasuhiro Kamada, Yoshitaka Sato, Masahiro Takizawa, Toru Shirai
-
Publication number: 20220373629Abstract: During obtaining a sensitivity distribution in a k-space, data based on which the sensitivity distribution is obtained is expanded with a mirror image to create an expanded image to prevent spectrum leakage, and the sensitivity distribution is stably calculated. During obtaining the sensitivity distribution in the k-space, image data based on which the sensitivity distribution is obtained is inverted as a mirror image to be made into the expanded image, the expanded image is transformed into k-space data, and a frequency component (frequency space data) of the sensitivity distribution is calculated. A region corresponding to the original image data is clipped from the calculated frequency space data, and the sensitivity distribution is obtained.Type: ApplicationFiled: April 28, 2022Publication date: November 24, 2022Inventors: Shinji Kurokawa, Yasuhiro Kamada, Toru Shirai, Takenori Murase, Hiroki Shoji
-
Patent number: 11393073Abstract: In an image acquired by a plurality of receiver coils with the use of MRI, separated images are obtained by separating spatially overlapping signals according to PI method, and noise in the separated images is eliminated with a high degree of precision. A complex image spatially overlapping is measured from nuclear magnetic resonance signals received by a plurality of receiver coils, and spatially overlapping signals are separated and a plurality of separated images are calculated, by using sensitivity information of the plurality of receiver coils. Then, noise is eliminated based on a correlation of noise mixed between the separated images.Type: GrantFiled: July 27, 2018Date of Patent: July 19, 2022Assignee: FUJIFILM Healthcare CorporationInventors: Toru Shirai, Ryota Satoh, Yasuhiro Kamada, Masahiro Takizawa, Yoshihisa Sotome
-
Publication number: 20220221543Abstract: To provide a technique in which, in imaging using an EPI method, an occurrence of an artifact when phase correction is performed for each channel is avoided and the phase correction is accurately performed. A common phase correction value to be applied to data of all channels is calculated using pre-scan data of each channel. The common phase correction value is obtained by combining a difference phase obtained for each of the channels. The difference phase is obtained by complex integration, while an absolute value of each channel is maintained as it is. The combination is performed by complex average, and averaging processing according to a weight of the absolute value is performed. The occurrence of an artifact can be prevented by using the common phase correction value, and robust phase correction can be performed by including the weight of the absolute value.Type: ApplicationFiled: December 20, 2021Publication date: July 14, 2022Inventors: Ryota SATOH, Keisuke NISHIO, Yasuhiro KAMADA, Yoshitaka SATO, Masahiro TAKIZAWA, Toru SHIRAI
-
Publication number: 20210068700Abstract: To calculate a high-resolution coil sensitivity distribution that does not depend on a shape or a structure of a subject with high accuracy. An MRI apparatus of the invention includes: a measurement unit that includes a reception coil including a plurality of channels, a measurement unit that measures a nuclear magnetic resonance signal of a subject for every channel of the reception coil; and an image computation unit that creates an image of the subject by using a sensitivity distribution for every channel of the reception coil, and a channel image obtained from the nuclear magnetic resonance signal measured by the measurement unit for every channel. The image computation unit includes a sensitivity distribution calculation unit that calculates a sensitivity distribution on a k-space for every channel by using the channel images and a composite image obtained by combining the channel images.Type: ApplicationFiled: September 13, 2018Publication date: March 11, 2021Inventors: Toru SHIRAI, Yasuhiro KAMADA, Masahiro TAKIZAWA, Hisaaki OCHI
-
Publication number: 20200258199Abstract: In an image acquired by a plurality of receiver coils with the use of MRI, separated images are obtained by separating spatially overlapping signals according to PI method, and noise in the separated images is eliminated with a high degree of precision. A complex image spatially overlapping is measured from nuclear magnetic resonance signals received by a plurality of receiver coils, and spatially overlapping signals are separated and a plurality of separated images are calculated, by using sensitivity information of the plurality of receiver coils. Then, noise is eliminated based on a correlation of noise mixed between the separated images.Type: ApplicationFiled: July 27, 2018Publication date: August 13, 2020Inventors: Toru SHIRAI, Ryota SATOH, Yasuhiro KAMADA, Masahiro TAKIZAWA, Yoshihisa SOTOME
-
Publication number: 20180267124Abstract: In an imaging method using k space low-frequency region data including a lot of useful information, in order to obtain an image with high quality without increasing measurement time by measuring a minimum required region in proper quantities, according to the present invention, pre-measurement is performed prior to main measurement, a rough shape of k space low-frequency region data is measured with respect to each signal reception channel, so as to be set as k space characteristics, and a range measured as a k space low-frequency region is specified in the measurement. The specified result is reflected in an imaging sequence, and thus k space low-frequency region data including useful information which can be used for a process is appropriately collected.Type: ApplicationFiled: January 19, 2016Publication date: September 20, 2018Inventors: Yasuhiro KAMADA, Yoshiyuki KUNUGI
-
Publication number: 20170200291Abstract: In k space parallel imaging, the image reconstruction processing is increased in speed without deteriorating the image quality. Therefore, interpolation processing in the image reconstruction processing of the k space parallel imaging is segmented into element data generation processing in which measured k space data of one of channels is used such that element data of interpolation data of all of the channels is generated, and addition processing in which the generated element data is added for each channel. The element data generation processing is segmented into units set in advance, for example, for each channel and the element data generation processing is executed in parallel.Type: ApplicationFiled: July 8, 2015Publication date: July 13, 2017Applicant: HITACHI, LTD.Inventors: Yasuhiro KAMADA, Katsunari NAGASHIMA
-
Patent number: 9594142Abstract: In order to improve contrast in non-orthogonal measurement without sacrificing speed, in imaging which combines a fast imaging sequence for acquiring a plurality of echo signals in one shot with non-orthogonal system measurement, the shape of a blade in which an echo train of each shot is arranged is a fan shape having the radius and the arc of a circle centered on the origin of a k space. At this time, echo signal arrangement is controlled such that an echo signal for desired TE of each fan-shaped blade is arranged in a low spatial frequency region of the k space.Type: GrantFiled: May 9, 2012Date of Patent: March 14, 2017Assignee: HITACHI, LTD.Inventors: Yasuhiro Kamada, Masahiro Takizawa
-
Patent number: 9535146Abstract: In the non-Cartesian measurement, image quality is improved while the advantages of non-Cartesian measurement are maintained. To realize the aforementioned, in the non-Cartesian measurement, artifacts caused by non-uniform data density in k-space are reduced. Therefore, each unit k-space is imaged by an inverse Fourier transform, the field of view of the image is enlarged in a direction in which data density is to be increased, and the image after the enlargement of the field of view is Fourier transformed and gridded as unit k-space that has a small k-space pitch in the direction in which the field of view has been enlarged and has an increased amount of data. This processing is repeated for all blades.Type: GrantFiled: September 19, 2012Date of Patent: January 3, 2017Assignee: HITACHI, LTD.Inventors: Yasuhiro Kamada, Hikaru Hanada, Masahiro Takizawa
-
Patent number: 9513356Abstract: In order to improve contrast and image quality in non-orthogonal measurement without sacrificing speed, in imaging which combines a fast imaging sequence for acquiring a plurality of echo signals in one shot with non-orthogonal system measurement, the shape of a blade in which an echo train of each shot is arranged includes a fan-shaped region having the radius and the arc of a circle centered on the origin of the k space, and a region overlapping an adjacent blade. During measurement, control is performed such that an echo signal for desired TE of each blade is arranged in a low spatial frequency region of a k space, and during image reconstruction, body motion between the blades is corrected using data of the overlapping regions.Type: GrantFiled: May 9, 2012Date of Patent: December 6, 2016Assignee: HITACHI, LTD.Inventors: Yasuhiro Kamada, Masahiro Takizawa
-
Patent number: 9364166Abstract: In order to make it possible to set the optimal breath-holding imaging conditions according to the subject without extension of an imaging time or the sacrifice of image quality, one scan is divided into one or more breath-holding measurements and free-breathing measurements on the basis of the imaging conditions of a breath-holding measurement, which are input and set according to the subject, and a region of the k space measured in the breath-holding measurement is controlled. Preferably, in the breath-holding measurement, low-frequency data of the k space is measured. Moreover, preferably, imaging conditions of the breath-holding measurement include the number of times of breath holding or a breath-holding time, and the operator can set any of these values.Type: GrantFiled: November 22, 2013Date of Patent: June 14, 2016Assignee: Hitachi, Ltd.Inventor: Yasuhiro Kamada
-
Patent number: 9325921Abstract: A solid-state imaging apparatus includes: a solid-state imaging device mounted on a substrate; a bonding wire that electrically connects a pad formed on the solid-state imaging device to a lead island formed on the substrate; a frame member that has a frame-like shape and surrounds side portions of the solid-state imaging device; and a light-transmissive optical member so accommodated in the frame member that the optical member faces an imaging surface of the solid-state imaging device, wherein the frame member has a leg portion extending from the side where the optical member is present toward the imaging surface, and the frame member is integrally fixed to the solid-state imaging device with an end of the bonding wire that is connected to the pad covered with the leg portion.Type: GrantFiled: April 2, 2015Date of Patent: April 26, 2016Assignee: Sony CorporationInventor: Yasuhiro Kamada
-
Publication number: 20150215551Abstract: A solid-state imaging apparatus includes: a solid-state imaging device mounted on a substrate; a bonding wire that electrically connects a pad formed on the solid-state imaging device to a lead island formed on the substrate; a frame member that has a frame-like shape and surrounds side portions of the solid-state imaging device; and a light-transmissive optical member so accommodated in the frame member that the optical member faces an imaging surface of the solid-state imaging device, wherein the frame member has a leg portion extending from the side where the optical member is present toward the imaging surface, and the frame member is integrally fixed to the solid-state imaging device with an end of the bonding wire that is connected to the pad covered with the leg portion.Type: ApplicationFiled: April 2, 2015Publication date: July 30, 2015Inventor: Yasuhiro Kamada
-
Patent number: 9025079Abstract: A solid-state imaging apparatus includes: a solid-state imaging device mounted on a substrate; a bonding wire that electrically connects a pad formed on the solid-state imaging device to a lead island formed on the substrate; a frame member that has a frame-like shape and surrounds side portions of the solid-state imaging device; and a light-transmissive optical member so accommodated in the frame member that the optical member faces an imaging surface of the solid-state imaging device, wherein the frame member has a leg portion extending from the side where the optical member is present toward the imaging surface, and the frame member is integrally fixed to the solid-state imaging device with an end of the bonding wire that is connected to the pad covered with the leg portion.Type: GrantFiled: March 16, 2012Date of Patent: May 5, 2015Assignee: Sony CorporationInventor: Yasuhiro Kamada
-
Publication number: 20140361771Abstract: In order to improve contrast and image quality in non-orthogonal measurement without sacrificing speed, in imaging which combines a fast imaging sequence for acquiring a plurality of echo signals in one shot with non-orthogonal system measurement, the shape of a blade in which an echo train of each shot is arranged includes a fan-shaped region having the radius and the arc of a circle centered on the origin of the k space, and a region overlapping an adjacent blade. During measurement, control is performed such that an echo signal for desired TE of each blade is arranged in a low spatial frequency region of a k space, and during image reconstruction, body motion between the blades is corrected using data of the overlapping regions.Type: ApplicationFiled: May 9, 2012Publication date: December 11, 2014Applicant: HITACHI MEDICAL CORPORATIONInventors: Yasuhiro Kamada, Masahiro Takizawa
-
Publication number: 20140197835Abstract: In the non-Cartesian measurement, image quality is improved while the advantages of non-Cartesian measurement are maintained. To realize the aforementioned, in the non-Cartesian measurement, artifacts caused by non-uniform data density in k-space are reduced. Therefore, each unit k-space is imaged by an inverse Fourier transform, the field of view of the image is enlarged in a direction in which data density is to be increased, and the image after the enlargement of the field of view is Fourier transformed and gridded as unit k-space that has a small k-space pitch in the direction in which the field of view has been enlarged and has an increased amount of data. This processing is repeated for all blades.Type: ApplicationFiled: September 19, 2012Publication date: July 17, 2014Applicant: HITACHI MEDICAL CORPORATIONInventors: Yasuhiro Kamada, Hikaru Hanada, Masahiro Takizawa
-
Publication number: 20140081124Abstract: In order to make it possible to set the optimal breath-holding imaging conditions according to the subject without extension of an imaging time or the sacrifice of image quality, one scan is divided into one or more breath-holding measurements and free-breathing measurements on the basis of the imaging conditions of a breath-holding measurement, which are input and set according to the subject, and a region of the k space measured in the breath-holding measurement is controlled. Preferably, in the breath-holding measurement, low-frequency data of the k space is measured. Moreover, preferably, imaging conditions of the breath-holding measurement include the number of times of breath holding or a breath-holding time, and the operator can set any of these values.Type: ApplicationFiled: November 22, 2013Publication date: March 20, 2014Applicant: Hitachi Medical CorporationInventor: Yasuhiro KAMADA
-
Publication number: 20140055137Abstract: In order to improve contrast in non-orthogonal measurement without sacrificing speed, in imaging which combines a fast imaging sequence for acquiring a plurality of echo signals in one shot with non-orthogonal system measurement, the shape of a blade in which an echo train of each shot is arranged is a fan shape having the radius and the arc of a circle centered on the origin of a k space. At this time, echo signal arrangement is controlled such that an echo signal for desired TE of each fan-shaped blade is arranged in a low spatial frequency region of the k space.Type: ApplicationFiled: May 9, 2012Publication date: February 27, 2014Applicant: HITACHI MEDICAL CORPORATIONInventors: Yasuhiro Kamada, Masahiro Takizawa