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31. 发明专利

JPH04184897A X-RAY PHOTOGRAPHING DEVICE 失效
公开(公告)号：JPH04184897A
公开(公告)日：1992-07-01
申请号：JP30890690
申请日：1990-11-16
申请人： HITACHI MEDICAL CORP
发明人： YOKOUCHI HISATAKE , ONODERA YOICHI , TAKAHASHI FUMITAKA , IKEDA MITSURU , KOIKE KOICHI
IPC分类号： H05G1/64
摘要： PURPOSE:To obtain a X-ray pickup device having good operability and high resolution by selecting a diameter of the maximum input visual field of a X-ray fluorescent multiplier tube, a diameter of an output image, and a ratio of both the diameters from a specific value range respectively. CONSTITUTION:High resolution of a X-ray I I is needed for improving resolution of a X-ray pickup device, and the resolution of the whole X-ray I I can be bettered when a diameter of an output image of an output fluorescent screen of the X-ray I I is selected to 50-60mm. An image on an input fluorescent screen is reductionally imaged on the output fluorescent screen in the X-ray I I, consequently a ratio of both has a great influence on the resolution. A diameter of the maximum inlet visual field, nearly equal to an aperture dimension of the X-ray I I, is made the X-ray I I for actual time digital radiography, 10-18in., and a reduction rate M of 5-7 times is selected. A dimension in a depth direction is limited to 700-800mm when the X-ray I I and a distributor are connected, enabling the X-ray pickup device to be mounted on a former TV camera. This constitution can obtain the X-ray pickup device having good operability and high resolution.

32. 发明专利

JPH03233828A ELECTRON BEAM CURRENT QUANTITY MEASURING INSTRUMENT 失效
公开(公告)号：JPH03233828A
公开(公告)日：1991-10-17
申请号：JP2855590
申请日：1990-02-09
申请人： HITACHI MEDICAL CORP
发明人： ONODERA YOICHI , YOKOUCHI HISATAKE
IPC分类号： H01J9/44 , H01J31/28
摘要： PURPOSE:To set a beam current quantity quantitatively with high accuracy and excellent repeatability and easily by comprising a storage means for storing the typical characteristic for specifying Ib characteristic of image pickup tubes to be measured, and detecting means and scaling means for manufacturing the characteristic of each image pickup tube from the typical characteristic. CONSTITUTION:A storage means 1 stores a typical beam current quantity Ib - control electrode voltage Ec1 characteristic (abbreviated as Ib characteristic) of an image pickup tube. When Ec1 of each image pickup tube is changed in a range from maximum to minimum under the condition of incidence of the light with random constant intensity, a detecting means 2 detects a value Ec1o of Ec1 at the time that a signal current value Iso and Ib are changed. A scaling means 3 specifies a value of Ec1 of the detected Iso at Ec1o, and scales so that the typical characteristic stored in the storage means 1 passes on a point of Iso.Ec1o. An output means 4 outputs the scaled Ib characteristic to the outside. A measurement with high accuracy and repeatability can be thereby performed.

33. 发明专利

JPH02195781A IMAGE INPUT DEVICE 失效
公开(公告)号：JPH02195781A
公开(公告)日：1990-08-02
申请号：JP1395289
申请日：1989-01-25
申请人： HITACHI MEDICAL CORP
发明人： YOKOUCHI HISATAKE , ONODERA YOICHI , FUNO TAKAKAZU , TSUNEOKA MASAYUKI
IPC分类号： A61B6/00 , H04N5/228 , H04N5/32 , H05G1/60
摘要： PURPOSE:To attain the high S/N and wide dynamic range of a TV camera apparatus by varying a target voltage to be applied on an image pickup tube at every scanning mode. CONSTITUTION:When the scanning mode and fluoroscopy/image pickup are designated at a console, a signal representing a designation mode is transmitted to the control part 40 of a TV camera via an input control part. Thereby, horizontal and vertical synchronizing signals corresponding to a designated scanning mode are generated 39, and are sent to a deflecting signal generation part 36. Generated horizontal and vertical synchronizing signals permit a deflecting current to flow on horizontal and vertical deflecting coils 29 and 30. Also, the target voltage corresponding to the scanning mode is applied on the target ring 21 of the image pickup tube 20 from a control part 34, and also, a beam current control voltage is generated from a control part 37, then, it is applied on the beam control electrode 25 of the image pickup tube 20.

34. 发明专利

JPS6367986A X RAY MOVING PICTURE RECORDER 失效
公开(公告)号：JPS6367986A
公开(公告)日：1988-03-26
申请号：JP21161586
申请日：1986-09-10
申请人： HITACHI MEDICAL CORP
发明人： MOTOIKE JUN , YOKOUCHI HISATAKE , TSUNEOKA MASAYUKI
IPC分类号： H04N5/765 , G06T1/00 , H04N5/91 , H04N7/01
摘要： PURPOSE:To equally record by either one of a skip scanning system or a sequential scanning system by storing an output signal from a TV camera in a picture memory as a digital by an A/D converter and carrying out the reading and the writing of a picture memory by respectively individually shifting the phase of an address. CONSTITUTION:When the output signal of the TV camera of the sequential scanning system is recorded on a video tape recorder, the writing to the picture memory is successively carried out to the scanning. The reading of data is attained by reading an odd number line and then reading an even number line. The output signal of the X ray TV camera 1 is converted into the digital signal in the A/D converting part 2, passed through a selection circuit 3, guided to an arithmetic control circuit 4 and stored in the picture memory 5. The output of the picture memory 5 is guided to a data converting part 8, converted into a signal for recording, thereafter, supplied to the video tape recorder 9. A reproduced signal from the video tape recorder 9 is converted into an original picture by the data converting part 8, passed through the selection circuit 3 and guided to the arithmetic control circuit 4.

35. 发明专利

JPS6323134A COMBINED OPTICAL DEVICE 失效
公开(公告)号：JPS6323134A
公开(公告)日：1988-01-30
申请号：JP16699886
申请日：1986-07-16
申请人： HITACHI MEDICAL CORP
发明人： UMETANI KEIJI , YOKOUCHI HISATAKE , TAKAHASHI FUMITAKA , TSUNEOKA MASAYUKI
IPC分类号： H05G1/64 , A61B6/00 , G02F1/15 , G02F1/17
摘要： PURPOSE:To prevent variation of the optical characteristic of a picture detector, such as F-number, etc., by light quantity adjustment, by constituting a means which adjusts the input light quantity of the picture detector of a transmission factor continuously changing type filter. CONSTITUTION:An image by incident photons 10 is amplified in luminance by means of an image intensifier 1 and outputted as a visual-light image to an output surface 6. The image forms an image in a picture detector 3 after passing through a combined optical device 2. The combined optical device 2 is provided with a filter 4 using an electro-chromic material and the transmission factor of the filter 4 is electrically adjusted by means of a filter controller 7 by detecting the intensity variation of the incident photons 10 with an incident photon detector 9 which detects the intensity of the incident photons 10 to the image intensifier 1. Therefore, images can always be formed in the picture detector 3 at the optimum light quantity.

36. 发明专利

JPS5374340A VARIABLE DELAY CIRCUIT 失效
公开(公告)号：JPS5374340A
公开(公告)日：1978-07-01
申请号：JP14968576
申请日：1976-12-15
申请人： HITACHI MEDICAL CORP
发明人： KONDOU TOSHIROU , YOKOUCHI HISATAKE , KURODA MASAO , ONO SEKIJIYUROU
IPC分类号： H03H11/26 , A61B8/00 , A61B10/00 , G01N29/04 , G01N29/44 , H03H7/30 , H03K3/80 , H03K17/60

37. 发明专利

JPH08265646A X-RAY IMAGE PICKUP DEVICE 失效
公开(公告)号：JPH08265646A
公开(公告)日：1996-10-11
申请号：JP6902295
申请日：1995-03-28
申请人： HITACHI ELECTRONICS , HITACHI MEDICAL CORP
发明人： FUJIMURA NOBURO , YOKOUCHI HISATAKE , TAKAHASHI FUMITAKA
IPC分类号： G01N23/04 , H04N5/32 , H04N5/335 , H04N5/341 , H04N5/353 , H04N5/361 , H04N5/369 , H04N5/372 , H04N5/378
摘要： PURPOSE: To provide the X-ray image pickup device by which an image signal with high image quality is obtained by eliminating a dark current stored in a signal charge vertical transfer path of a CCD and eliminating the dark current or other noise component stored in a photodiode of the CCD before radiation of an X-ray. CONSTITUTION: The X-ray image pickup device having an X-ray source, an X-ray image intensifier, and a solid-state image pickup element is provided with a means 15 generating all sweepout transmission pulses B67 in existence within a generating period of a sweepout transfer pulse control signal 63 among sweepout transfer pulses A61 based on the sweepout transfer pulse control signal 63 and the sweepout transfer pulse A61 and a means 16 generating a sweepout transfer pulse and a ternary pulse based on the sweepout transfer pulse B67(68) and read pulses 65, 66.

38. 发明专利

JPH0847490A X-RAY CAMERA 失效
公开(公告)号：JPH0847490A
公开(公告)日：1996-02-20
申请号：JP18703594
申请日：1994-08-09
申请人： HITACHI MEDICAL CORP
发明人： BABA RIKA , UEDA TAKESHI , YOKOUCHI HISATAKE
IPC分类号： A61B6/00 , H04N5/321
摘要： PURPOSE:To achieve a higher diagnosing performance at a peripheral part of a picture of a large field digital X-ray image by enabling the correction of geometric distortion without lowering a resolving power of an interested area. CONSTITUTION:In an X-ray camera which is made up of an X-ray tube 2, X-ray TV cameras 4 and 5 and an image collector/processor 6 to correct the distortion of a taken image of a subject 7, a means (elongation means 6a) is provided to set a pixel size for the image collector/processor 6 so that the size on an input surface of the X-ray TV camera of an image after the correction of the distortion is smaller than the minimum value in an interest area specified separately of the pixel size on an X-ray inputting surface of the image before the correction of the distortion.

39. 发明专利

JPH07136155A RADIATION IMAGE PHOTOGRAPHIC APPARATUS 失效
公开(公告)号：JPH07136155A
公开(公告)日：1995-05-30
申请号：JP28249193
申请日：1993-11-11
申请人： HITACHI MEDICAL CORP
发明人： UMETANI KEIJI , HIRAI TADAAKI , UEDA TAKESHI , YOKOUCHI HISATAKE
IPC分类号： A61B6/00
摘要： PURPOSE:To provide a radiation image photographing apparatus wherein restriction to the aberration of an optical lens can be reluxed and a continuous image photographing in a large field of view to an radiation is possible by providing a curved face structure to a fluorescent screen. CONSTITUTION:A curved fluorescent screen with a concave face to an optical lens 20 side is used as a fluorescent screen 10. In addition, the shape of the curved face of the fluorescent screen 10 is a rotationally symmetric curved face to an axis connecting an X-ray tube focus of an X-ray tube 5 and a center of the optical lens 20. By using this screen, it is possible to decrease an optical system contg. the optical lens 20 and to decrease the influence of curving of an image face and a strain of the image on a focused image. Therefore, the optical lens 20 can be made close to the fluorescent screen 10 and an image with a high brightness can be made on an image detecting face of a video camera 30. Furthermore, as the aberration is small, an image with a high quality can be detected and, as the results, photographing of an image over a large field of view which is hardly realized by using X-ray becomes possible.

40. 发明专利

JPH06319729A X-RAY PHOTOGRAPHING METHOD AND APPARATUS 失效
公开(公告)号：JPH06319729A
公开(公告)日：1994-11-22
申请号：JP10914193
申请日：1993-05-11
申请人： HITACHI MEDICAL CORP
发明人： BABA RIKA , UEDA TAKESHI , HARA MOICHI , UMETANI KEIJI , ONODERA YOICHI , KAJIYAMA TOMOHARU , YOKOUCHI HISATAKE , TAKAHASHI FUMITAKA
IPC分类号： A61B6/00 , A61B6/06 , H04N5/321
摘要： PURPOSE:To enable the X-ray photographing of the area wider than the visual field an X-ray detector with high spatial resolving power by providing a mechanism moving an X-ray detection system so as to make the same parallel to an X-ray grid to perform photographing two or more times not only to accurately perform the joining of an image but also to shield an unnecessary visual from X-rays. CONSTITUTION:An X-ray grid 6 is arranged at a position where the center line connecting the center of the surface of the grid and an X-ray source from an X-ray tube 3 becomes vertical to the surface of the grid. The X-ray grid 6 arranged in a longitudinal direction so that X-ray absorbing plates 6-1, 6-2, 6-3 constituting the grid 6 become vertical to the moving direction of an X-ray detection system for twice photographing. The periphery of the X-ray grid 6 is covered with an X-ray shield plate 21 and the part not covered with the grid of the X-ray input surface of the X-ray detection system is covered with the X-ray shield plate.

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