# US 2017/0285189 A1 · Radiation imaging apparatus, radiation imaging system, and method of operating radiation imaging apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0285189 A1 - Document ID: US20170285189A1 - Status: Published application - Kind: A1 - Application number: 15/446,187 - Filed: 2017-03-01 - Published: 2017-10-05 - Earliest claimed: 2016-03-29 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Takuya Ryu; Tomoyuki Yagi; Katsuro Takenaka; Hideyuki Okada; Eriko Sato; Shinichi Takeda - Web page: https://patentgrep.com/patent/US20170285189A1 ## CPC - A61B 6/487: {involving fluoroscopy} - A61B 6/54: {Control of apparatus or devices for radiation diagnosis} - G01N 23/043: {using fluoroscopic examination, with visual observation or video transmission of fluoroscopic images} - G01T 1/247: {Detector read-out circuitry (for processing gain or off-set correction H04N)} - H04N 25/63: applied to dark current - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A radiation imaging apparatus includes a pixel array, a scanning circuit for scanning a plurality of rows of the pixel array in accordance with a selected mode of a plurality of modes, and a readout circuit configured to read out signals from pixels on a selected row in scanning by the scanning circuit. The plurality of modes include a first mode of performing image capturing at a first frame rate and a second mode of performing image capturing at a second frame rate lower than the first frame rate. The number of times of scanning on the plurality of rows by the scanning circuit in one frame period in the second mode is larger than that of scanning on the plurality of rows by the scanning circuit in one frame period in the first mode. ## Claims ### Claim 1 A radiation imaging apparatus comprising: a pixel array having a plurality of pixels arrayed to form a plurality of rows and a plurality of columns; a scanning circuit configured to scan the plurality of rows of the pixel array in accordance with a selected mode of a plurality of modes; and a readout circuit configured to read out signals from pixels on a selected row in scanning by the scanning circuit, wherein the plurality of modes include a first mode of performing image capturing at a first frame rate and a second mode of performing image capturing at a second frame rate lower than the first frame rate, and the number of times of scanning on the plurality of rows by the scanning circuit in one frame period in the second mode is larger than the number of times of scanning on the plurality of rows by the scanning circuit in one frame period in the first mode. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein one frame period in the first mode includes an accumulation period in which the plurality of pixels accumulate signals corresponding to applied radiation, and a readout period in which the readout circuit reads out signals corresponding to one frame from the pixel array while the scanning circuit scans the plurality of rows, and one frame period in the second mode includes an accumulation period in which the plurality of pixels accumulate signals corresponding to applied radiation, a readout period in which the readout circuit reads out signals corresponding to one frame from the pixel array while the scanning circuit scans the plurality of rows, and a reset period in which the scanning circuit scans the plurality of rows so as to reset the plurality of pixels. ### Claim 3 (depends on 2) The apparatus according to claim 2, wherein one frame period in the second mode includes a plurality of reset periods including the reset period. ### Claim 4 (depends on 3) The apparatus according to claim 3, wherein a time required for the scanning circuit to scan the plurality of rows in a last reset period of the plurality of reset periods in the second mode is equal to a time required for the scanning circuit to scan the plurality of rows in the readout period in the second mode. ### Claim 5 (depends on 4) The apparatus according to claim 4, wherein the number of rows simultaneously selected by the scanning circuit remains the same when the scanning circuit scans the plurality of rows in the last reset period of the plurality of reset periods in the second mode and when the scanning circuit scans the plurality of rows in the readout period in the second mode. ### Claim 6 (depends on 4) The apparatus according to claim 4, wherein a time from a start of selection of a given row to a start of selection of a next row remains the same between a case in which the scanning circuit scans the plurality of rows in the last reset period of the plurality of reset periods in the second mode and a case in which the scanning circuit scans the plurality of rows in the readout period in the second mode. ### Claim 7 (depends on 3) The apparatus according to claim 3, wherein a time required for the scanning circuit to scan the plurality of rows in a reset period before the last reset period of the plurality of reset periods is shorter than a time required for the scanning circuit to scan the plurality of rows in the last reset period. ### Claim 8 (depends on 4) The apparatus according to claim 4, wherein the scanning circuit scans the plurality of rows in increments of at least two rows in a reset period before the last reset period of the plurality of reset periods. ### Claim 9 (depends on 1) The apparatus according to claim 1, further comprising a controller configured to switch one of the first mode and the second mode to the other of the first mode and the second mode when capturing a moving image. ### Claim 10 (depends on 1) A radiation imaging system comprising: a radiation source configured to generate radiation; and a radiation imaging apparatus defined in claim 1. ### Claim 11 A method of operating a radiation imaging apparatus comprising a pixel array having a plurality of pixels arrayed to form a plurality of rows and a plurality of columns, a scanning circuit configured to scan the plurality of rows of the pixel array in accordance with a selected mode of a plurality of modes, and a readout circuit configured to read out signals from pixels on a selected row in scanning by the scanning circuit, Wherein the plurality of modes include a first mode of performing image capturing at a first frame rate and a second mode of performing image capturing at a second frame rate lower than the first frame rate, and the number of times of scanning on the plurality of rows by the scanning circuit in one frame period in the second mode is larger than the number of times of scanning on the plurality of rows by the scanning circuit in one frame period in the first mode. ### Claim 12 (depends on 11) The method according to claim 11, wherein one frame period in the first mode includes an accumulation period in which the plurality of pixels accumulate signals corresponding to applied radiation, and a readout period in which the readout circuit reads out signals corresponding to one frame from the pixel array while the scanning circuit scans the plurality of rows, and one frame period in the second mode includes an accumulation period in which the plurality of pixels accumulate signals corresponding to applied radiation, a readout period in which the readout circuit reads out signals corresponding to one frame from the pixel array while the scanning circuit scans the plurality of rows, and a reset period in which the scanning circuit scans the plurality of rows so as to reset the plurality of pixels.