摘要:
PROBLEM TO BE SOLVED: To provide a method for producing an artifact-corrected image of a negative jaw impression in a recipient jaw. SOLUTION: This method for producing an artifact-corrected image of a negative jaw impression in a recipient jaw includes: a process of forming a negative impression of the recipient jaw; a process of producing a first digital image of the negative jaw impression; a process of producing a second digital image including the artifacts of the negative jaw impression in the recipient jaw; and a process of using the first digital image to produce an artifact-corrected computer representation of the negative impression in the recipient jaw. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To certainly perform the compensation of temperature to at least one change of the sensitivity, dark current, difference in level of density and afterimage in a radiation converting panel caused by a change in the temperature of the radiation converting panel. SOLUTION: A radiation detector 10 includes the radiation converting panel 40 for detecting the radiation 14 transmitted through a subject 18 to convert the same to radiation image data, a temperature detecting means 36 for detecting the temperature of the radiation converting panel 40 and a correction means 88 for correcting at least one of the sensitivity, dark current, difference in level of density and afterimage in the radiation converting panel 40 on the basis of the detected temperature. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
The device has an artifact determining unit (27-1) determining each pixel, which is contained in a tomography image, as an artifact. An artifact determining unit (27-2) presets a decision pixel range, which contains a target pixel. The unit (27-2) again determines the target pixel as the artifact, when each pixel, which is judged by the unit (27-1) as that pixel, at which the artifact can be generated, lies above a preset reference. An artifact reduction unit (25) is provided for the effectuation of an imaging process for the reduction of an artifact on each pixel. An independent claim is also included for a method for reducing artifacts in a tomography image.
摘要:
PROBLEM TO BE SOLVED: To determine a more accurate beam hardening (BH) correction coefficient. SOLUTION: In an X-ray CT system, an annular (sector) phantom 330 uniform in thickness and cross section is positioned and scanned from many directions to acquire a plurality of views and the results of the scan is used to calculate a correction coefficient that is used to correct projection information to be acquired from a subject. COPYRIGHT: (C)2008,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a medical image display device and a X-ray imaging device capable of reducing moire while the effect to other areas caused by partly correcting the image is decreased. SOLUTION: An image obtaining part obtains an image including moire, and a measuring part is a local area including every target pixel of the obtained image, and it measures the total amount of pixel value in the area of parallel direction to the running direction of moire (S1). A decision part decides the size of a filter for reducing moire based on the measured total amount (S3). A filter part performs filtering treatment to the target pixel with the decided size in the orthogonal direction of the moire running direction (S4). COPYRIGHT: (C)2007,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To achieve an adjustment of a CT value which is a pixel value of a tomographic image in the conventional scan (axial scan), cine scan, or helical scan by an X-ray CT apparatus with a multi-array X-ray detector or a two-dimensional area X-ray detector of a matrix arrangement represented by a multi-row X-ray detector or a flat panel detector. SOLUTION: The gain and bias of the projection data of each row are adjusted prior to three-dimensional back projection or reconstruction function convolution. Alternatively, the gain and bias are adjusted after determining the gain and bias value to adjust the CT value by taking account of the contribution rate to a tomographic image of each row after the three-dimensional back projection, or the gain and bias are adjusted after determining the gain and bias value to adjust the CT value by taking account of the contribution rate to the tomographic image of each row relying on the position of each row in z direction in case of axial scan after the three-dimensional back projection. COPYRIGHT: (C)2007,JPO&INPIT