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X-ray Imaging System for Medical Use
| Content Provider | The Lens |
|---|---|
| Related Links | https://www.lens.org/images/patent/EP/3042611/B1/EP_3042611_B1.pdf |
| Language | English |
| Publisher Date | 2022-09-21 |
| Access Restriction | Open |
| Alternative Title | Röntgenbildgebungssystem Zur Medizinischen Verwendung Système D'imagerie À Rayons X Pour Une Utilisation Médicale |
| Content Type | Text |
| Resource Type | Patent |
| Date Applied | 2009-04-22 |
| Agent | Boult Wade Tennant Llp |
| Applicant | Hamamatsu Photonics Kk |
| Application No. | 16156761 |
| Claim | An X-ray image pickup system for medical use which has at least two imaging modes, comprising a solid-state image pickup apparatus (1A, 1B), where M the solid-state image pickup apparatus (1A, 1B) has a photodetecting section (10A, 10B) which is formed such that M × N pixels respectively including photodiodes are two-dimensionally arrayed in M rows and N columns, the photodetecting section (10A, 10B) has a rectangular photosensitive surface whose longitudinal direction is the row direction, N readout wirings (Lo, n) which are installed on the respective columns, and connected to the photodiodes included in the pixels on corresponding columns via readout switches (SW1), a signal readout section (20) which holds voltage values corresponding to quantities of charges input via the readout wirings (Lo, n), and outputs the holding voltage values in series, an A/D converting section (30) which receives the holding voltage values output from the signal readout section (20) and performs analog-to-digital conversion processing with respect to the holding voltage values, to output digital values corresponding to the holding voltage values; a controlling section (6A, 6B) which controls switching operations of the readout switches of the respective pixels, and controls output operations of voltage values in the signal readout section, to output the voltage values corresponding to the quantities of charges generated in the photodiodes of the respective pixels from the signal readout section, and a scintillator (4) which generates a scintillation light according to an incident X-ray to convert the X-ray image into an optical image, and outputs the optical image to the photodetecting section (10A, 10B), wherein the solid-state image pickup apparatus (1A, 1B) is supported on a swivel arm (104) so as to permit the solid state image pickup apparatus (1A, 1B) to be swiveled around the test subject; and the longitudinal direction of the photodetecting section is parallel to a moving direction of the solid-state image pickup apparatus (1A, 1B) in one imaging mode of the two imaging modes, the controlling section (6A, 6B) outputs voltage values corresponding to the quantities of charges generated in the photodiodes of the respective pixels included in an imaging area in the photodetecting section (10A, 10B) from the signal readout section, wherein the imaging area in the one imaging mode and the imaging area in the other imaging mode are different from each other, the imaging area in the other imaging mode being a specific range set in a part of the photodetecting section, and a longitudinal direction of the specific range being perpendicular to the moving direction of the solid-state image pickup apparatus (1A, 1B), the one imaging mode is an imaging mode for carrying out CT scan in dental X-ray photography, and the other imaging mode is an imaging mode for carrying out panoramic radiography or cephalometrical radiography in dental X-ray photography, the signal readout section (2) is divided into a plurality of sets (21, 22, 23, 24), each set comprising a plurality of holding circuits, the A/D converting section (30) is divided into a plurality of sets (31, 32, 33, 34) corresponding to the plurality of sets (21, 22, 23, 24) of the signal readout section (20), and each set of the A/D converting section receives the holding voltage values output from the holding circuits of the respective set of the signal readout section (20) and performs analog-to-digital conversion processing with respect to the holding voltage values, to output digital values corresponding to the holding voltage values. The X-ray image system for medical use of claim 1, wherein the solid state image pickup apparatus (1A, 1B) is further supported for rotation around an axis line vertical to the photosensitive surface and controlled to a predetermined angular position according to the imaging mode. The X-ray image pickup system for medical use according to claim 2, wherein, a rotation center of the solid-state image pickup apparatus (1A, 1B) is located at one corner of the four corners of the rectangular photodetecting section (10A, 10B), and the solid-state image pickup apparatus (1A, 1B) is rotated such that the one corner is located on the lower jaw side of the test subject in both of the two imaging modes. The X-ray image pickup system for medical use according to claim 1, wherein, the controlling section (6A, 6B) outputs voltage values corresponding to the quantities of charges generated in the photodiodes of the M × N respective pixels in the photodetecting section (10A, 10B) from the signal readout section in the one imaging mode, and the controlling section (6A, 6B) outputs voltage values corresponding to the quantities of charges generated in the photodiodes of the respective pixels included in a specific range of successive M1 rows (M1 The X-ray image pickup system for medical use according to claim 4, wherein, in the other imaging mode, the controlling section (6A, 6B) sets a range of M1 rows counted in order from the row closest to the signal readout section (20) among the M rows in the photodetecting section (10A, 10B) as the specific range, and outputs voltage values corresponding to the quantities of charges generated in the photodiodes of the respective pixels in the specific range. The X-ray image pickup system for medical use according to claim 5, wherein, the solid-state image pickup apparatus further has disconnecting switches (SW11-SW1N) which are provided on the respective readout wirings between the specific range in the photodetecting section and the other range except for the specific range, and the controlling section (6B) closes the disconnecting switches (SW11-SW1N) in the one imaging mode, and opens the disconnecting switches (SW11-SW1N) in the other imaging mode. The X-ray image pickup system for medical use according to claim 4, wherein, the solid-state image pickup apparatus (1A, 1B) further has discharge means (SW2n) for discharging junction capacitance sections of the photodiodes of the respective pixels in the other range except for the specific range in the photodetecting section in the other imaging mode. The X-ray image pickup system for medical use according to claim 1, wherein, in the other imaging mode, the controlling section (6A, 6B) reduces a readout pixel pitch in frame data based on a voltage value output from the signal readout section as compared to the one imaging mode, speeds up a frame rate, that is the number of pieces of frame data to be output per unit time, and increases gain, that is a ratio of an output voltage value to an amount of input charges in the signal readout section. |
| CPC Classification | Diagnosis; Surgery; Identification Measurement Of Nuclear Or X-Radiation PICTORIAL COMMUNICATION; e.g. TELEVISION |
| Extended Family | 166-296-710-701-000 014-602-263-808-631 026-548-206-250-345 166-182-862-182-099 036-367-165-907-901 144-839-149-714-817 188-907-366-907-170 103-779-239-259-441 191-861-355-898-691 154-579-571-397-225 157-022-348-774-949 118-288-007-966-049 163-314-461-027-998 013-537-348-023-732 037-937-038-872-265 114-545-828-957-86X |
| Patent ID | 3042611 |
| Inventor/Author | Mori Harumichi Kyushima Ryuji Fujita Kazuki |
| IPC | A61B6/03 A61B6/51 G01T1/20 G01T1/29 H04N5/225 H04N5/32 H04N5/321 H04N5/335 H04N5/369 H04N5/374 H04N5/378 |
| Status | Active |
| Simple Family | 166-296-710-701-000 014-602-263-808-631 026-548-206-250-345 166-182-862-182-099 036-367-165-907-901 144-839-149-714-817 188-907-366-907-170 103-779-239-259-441 191-861-355-898-691 154-579-571-397-225 157-022-348-774-949 118-288-007-966-049 163-314-461-027-998 013-537-348-023-732 037-937-038-872-265 114-545-828-957-86X |
| CPC (with Group) | A61B6/03 A61B6/4233 A61B6/4441 G01T1/2928 A61B6/032 H04N23/58 H04N25/76 A61B6/51 H04N25/78 H04N23/30 H04N5/32 H04N25/75 |
| Issuing Authority | European Patent Office (EPO) |
| Kind | Patent/Patent 1st level of publication/Inventor's certificate |
