Abstract: Provided are MRI images with excellent image quality and in which the occurrence of artifacts is suppressed by effectively removing a secondary error magnetic field, generated by compensation current (additional current), of eddy current that is caused by applying a gradient magnetic field. The present invention measures and analyzes, in advance, a secondary error magnetic field generated due to the applying of compensation current and saves the results as compensation parameters (secondary compensation parameters), uses the secondary compensation parameters to calculate a correction magnetic field output to be applied to each of a gradient magnetic field coil and a correction coil, and supplies this correction magnetic field output to the gradient magnetic field coil and the correction coil to compensate for (cancel out) the secondary error magnetic field.

Abstract: An MRI apparatus capable of correcting a static magnetic field inhomogeneity caused by application of a gradient magnetic field by a simple calculation, and a correction method of the MRI apparatus are provided. An image quality deterioration due to the static magnetic field inhomogeneity caused by application of a gradient magnetic field is estimated by a simple calculation using a shape of a pulse sequence for imaging. An amount of distortion to be generated in the image acquired by executing the pulse sequence is estimated based on the estimated static magnetic field inhomogeneity and the shape of the pulse sequence, and a distortion of a reconstructed image is corrected. Alternatively, an output of a compensation magnetic field canceling the estimated static magnetic field inhomogeneity is calculated, and is superimposed on a compensation current with an active shimming so as to be supplied to a shim coil.

Abstract: The present invention is directed to enabling high-accuracy Nyquist ghost correction without using a reference image. After at least one of a plurality of images for use in diagnosis is used to perform low-order phase correction without causing aliasing of an image, a 2D phase map including remaining high-order phase errors and phase errors in a phase encode direction is calculated. The low-order phase correction is performed on a pair of pieces of data for image obtained by inverting a readout gradient magnetic field as image data for use in 2D phase map calculation, and positive-polarity/negative-polarity errors of the readout gradient magnetic field are calculated with odd lines and even lines of the pair of pieces of data for image rearranged. In the case of DWI imaging, an image with b-value=0 can be used for 2D phase map calculation.

Abstract: Provided are MRI images with excellent image quality and in which the occurrence of artifacts is suppressed by effectively removing a secondary error magnetic field, generated by compensation current (additional current), of eddy current that is caused by applying a gradient magnetic field. The present invention measures and analyzes, in advance, a secondary error magnetic field generated due to the applying of compensation current and saves the results as compensation parameters (secondary compensation parameters), uses the secondary compensation parameters to calculate a correction magnetic field output to be applied to each of a gradient magnetic field coil and a correction coil, and supplies this correction magnetic field output to the gradient magnetic field coil and the correction coil to compensate for (cancel out) the secondary error magnetic field.

Abstract: The present invention is directed to enabling high-accuracy Nyquist ghost correction without using a reference image. After at least one of a plurality of images for use in diagnosis is used to perform low-order phase correction without causing aliasing of an image, a 2D phase map including remaining high-order phase errors and phase errors in a phase encode direction is calculated. The low-order phase correction is performed on a pair of pieces of data for image obtained by inverting a readout gradient magnetic field as image data for use in 2D phase map calculation, and positive-polarity/negative-polarity errors of the readout gradient magnetic field are calculated with odd lines and even lines of the pair of pieces of data for image rearranged. In the case of DWI imaging, an image with b-value=0 can be used for 2D phase map calculation.

Abstract: A vehicle bottom structure includes a floor panel, a battery mounted on the floor panel, a deck board, and an inclined portion. The inclined portion is arranged adjacent to the battery. The inclined portion is inclined such that, in a direction parallel to a mounting surface of the floor panel, the inclined portion rises as a distance from the battery increases. The inclined portion includes an end facing the battery. The end is located above a lower surface of the battery and below half the height of the battery.

Abstract: A vehicle bottom structure includes a floor panel, a battery mounted on the floor panel, a deck board, and an inclined portion. The inclined portion is arranged adjacent to the battery. The inclined portion is inclined such that, in a direction parallel to a mounting surface of the floor panel, the inclined portion rises as a distance from the battery increases. The inclined portion includes an end facing the battery. The end is located above a lower surface of the battery and below half the height of the battery.

Abstract: A vehicle body frame includes: side frames that have at least inner walls that are disposed at vehicle transverse direction inner sides and upper walls that are disposed at vehicle body vertical direction upper sides, and that are formed as closed cross-sectional structures, and that extend in a vehicle body longitudinal direction, and that are fastened and fixed to under members that are disposed at a vehicle body lower side of a floor panel; and an upper frame that is disposed further toward a vehicle transverse direction inner side than the inner walls and at a height that is lower than the upper walls, and at which an installed object is installed.

Abstract: In order to obtain a highly reliable image with no image distortion or no artifacts, such as ghosting, by compensating for the distortion of an output gradient magnetic field waveform caused by various factors with high accuracy, an input gradient magnetic field waveform and an output gradient magnetic field waveform corresponding to the input gradient magnetic field waveform are calculated, a response function that is a sum of response functions of a plurality of elements affecting the output gradient magnetic field waveform is calculated using the input gradient magnetic field waveform and the output gradient magnetic field waveform, an output gradient magnetic field waveform is calculated from an input gradient magnetic field waveform of a gradient magnetic field pulse set in the imaging sequence using the response function, and various kinds of correction are performed using the calculated value of the calculated output gradient magnetic field waveform.

Abstract: A vehicle lower portion structure has: an undercover that is fixed to a lower portion of a vehicle body, and that covers a bottom surface side of the vehicle body; rockers that extend in a vehicle longitudinal direction at both sides in a vehicle transverse direction at the lower portion of the vehicle body; and rocker moldings that are fixed to the lower portion of the vehicle body, and are disposed at vehicle transverse direction outer sides of the undercover, and are provided from vehicle transverse direction outer sides of the rockers to vehicle lower sides. End portions at the vehicle transverse direction outer sides of the undercover, and end portions at vehicle transverse direction inner sides of the rocker moldings, are superposed one on another at least in a vehicle vertical direction.

Abstract: A tubular-shaped shock absorbing member arranged at a side end portion of a vehicle, includes outer and inner wall portions each extending in a vehicle height direction and a vehicle front-and-rear direction, the inner wall portion being arranged on a center portion side of the vehicle, an upper wall portion connected to upper end portions of the inner and outer wall portions, a lower wall portion connected to lower end portions of the inner and outer wall portions, and a horizontal rib connected to the inner and outer wall portions. A distance between the upper and lower wall portions is decreased as approaching from the inner wall portion side to the outer wall portion side. A thickness of a part of the horizontal rib connected to the outer wall portion, is larger than a thickness of a part of the horizontal rib connected to the inner wall portion.

Abstract: An outer energy absorbing member and an inner energy absorbing member are mounted on a lower surface side of a vehicle bottom part. The outer energy absorbing member and the inner energy absorbing member are arranged adjacent and in parallel to each other in a vehicle width direction. A recessed engagement part is formed in a side end part of the outer energy absorbing member on an inner side in the vehicle width direction, and a projecting engagement part is formed in a side end part of the inner energy absorbing member on an outer side in the vehicle width direction. The recessed engagement part and the projecting engagement part are engaged with each other at a time of side impact.

Abstract: A vehicle lower portion structure has: an undercover that is fixed to a lower portion of a vehicle body, and that covers a bottom surface side of the vehicle body; rockers that extend in a vehicle longitudinal direction at both sides in a vehicle transverse direction at the lower portion of the vehicle body; and rocker moldings that are fixed to the lower portion of the vehicle body, and are disposed at vehicle transverse direction outer sides of the undercover, and are provided from vehicle transverse direction outer sides of the rockers to vehicle lower sides. End portions at the vehicle transverse direction outer sides of the undercover, and end portions at vehicle transverse direction inner sides of the rocker moldings, are superposed one on another at least in a vehicle vertical direction.

Abstract: A vehicle body frame includes: side frames that have at least inner walls that are disposed at vehicle transverse direction inner sides and upper walls that are disposed at vehicle body vertical direction upper sides, and that are formed as closed cross-sectional structures, and that extend in a vehicle body longitudinal direction, and that are fastened and fixed to under members that are disposed at a vehicle body lower side of a floor panel; and an upper frame that is disposed further toward a vehicle transverse direction inner side than the inner walls and at a height that is lower than the upper walls, and at which an installed object is installed.

Abstract: An outer energy absorbing member and an inner energy absorbing member are mounted on a lower surface side of a vehicle bottom part. The outer energy absorbing member and the inner energy absorbing member are arranged adjacent and in parallel to each other in a vehicle width direction. A recessed engagement part is formed in a side end part of the outer energy absorbing member on an inner side in the vehicle width direction, and a projecting engagement part is formed in a side end part of the inner energy absorbing member on an outer side in the vehicle width direction. The recessed engagement part and the projecting engagement part are engaged with each other at a time of side impact.

Abstract: A vehicle body structure includes a bumper reinforcement, a front side member, and a bumper stay. The front side member is formed with a closed section portion, and a protruding portion that protrudes from this closed section portion toward a vehicle front side. The bumper stay, together with a protruding portion, forms an open section portion. Also, a notch is formed on the vehicle width direction inside of the closed section portion, and a cutout is formed on the vehicle width direction outside of the open section portion. Opposing wall portions that are fixed to protruding opposing portions and opposing wall portions that connect the cutout and the notch are formed on the bumper stay. These opposing wall portions are formed with extending edge portions that extend from the cutout side toward the notch side.

Abstract: A shock absorbing member is arranged at a side end portion of a vehicle, and is formed into a tubular shape extending in a vehicle front-and-rear direction. The shock absorbing member includes an outer wall portion formed so as to extend in a vehicle height direction and the vehicle front-and-rear direction, an inner wall portion formed so as to extend in the vehicle height direction and the vehicle front-and-rear direction, and arranged on a center portion side of the vehicle in a vehicle width direction with respect to the outer wall portion so as to be opposed to the outer wall portion, an upper wall portion connected to upper end portions of the inner wall portion and the outer wall portion, a lower wall portion connected to lower end portions of the inner wall portion and the outer wall portion, and a horizontal rib connected to the inner wall portion and the outer wall portion.

Abstract: In order to obtain a highly reliable image with no image distortion or no artifacts, such as ghosting, by compensating for the distortion of an output gradient magnetic field waveform caused by various factors with high accuracy, an input gradient magnetic field waveform and an output gradient magnetic field waveform corresponding to the input gradient magnetic field waveform are calculated, a response function that is a sum of response functions of a plurality of elements affecting the output gradient magnetic field waveform is calculated using the input gradient magnetic field waveform and the output gradient magnetic field waveform, an output gradient magnetic field waveform is calculated from an input gradient magnetic field waveform of a gradient magnetic field pulse set in the imaging sequence using the response function, and various kinds of correction are performed using the calculated value of the calculated output gradient magnetic field waveform.

Abstract: A vehicle body structure includes a bumper reinforcement, a front side member, and a bumper stay. The front side member is formed with a closed section portion, and a protruding portion that protrudes from this closed section portion toward a vehicle front side. The bumper stay, together with a protruding portion, forms an open section portion. Also, a notch is formed on the vehicle width direction inside of the closed section portion, and a cutout is formed on the vehicle width direction outside of the open section portion. Opposing wall portions that are fixed to protruding opposing portions and opposing wall portions that connect the cutout and the notch are formed on the bumper stay. These opposing wall portions are formed with extending edge portions that extend from the cutout side toward the notch side.