RADIATION IMAGE PHOTOGRAPHING DEVICE AND PROGRAM

• Main Author: SAWAGUCHI TOI
• Format: Patent
• Language: English; Japanese
• Published: 09.04.2020
• Subjects: DIAGNOSIS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; MEASUREMENT OF NUCLEAR OR X-RADIATION; MEASURING; MEDICAL OR VETERINARY SCIENCE; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; SURGERY; TESTING

To increase the accuracy of offset correction in performing video shooting, in a radiation image photographing device comprising a radiation detection element, an integration circuit, and a switch element.SOLUTION: A radiation image photographing device comprises: first circuit control means that causes a first sample hold circuit 512b to perform sampling for a predetermined time; second circuit control means that causes a second sample hold circuit 512c to perform sampling for a longer time than a time constant τ of the second sample hold circuit 512c; acquisition means that acquires correction information based on an output from a correlation double sampling circuit 512 every time the first and second sample hold circuits perform sampling in a non conducting state a predetermined number of times; correction value calculation means that calculates a correction value on the basis of the acquired correction information; correction means that corrects a signal value ΔV that is an output from the correlation double sampling circuit 512 after the second sample hold circuit performs sampling through a conducting state; and image creation means that creates a radiation image on the basis of the corrected signal value.SELECTED DRAWING: Figure 3 【課題】放射線検出素子と、積分回路と、スイッチ素子と、を備えた放射線画像撮影装置において、動画撮影を行う際のオフセット補正の精度を高める。【解決手段】放射線画像撮影装置は、第一サンプルホールド回路５１２ｂに所定時間サンプリングさせる第一回路制御手段と、第二サンプルホールド回路５１２ｃに、当該第二サンプルホールド回路５１２ｃの時定数τよりも長い時間サンプリングさせる第二回路制御手段と、非導通状態におけるサンプリングを所定回数行う毎に、相関二重サンプリング回路５１２の出力に基づく補正情報を取得する取得手段と、取得した補正情報に基づいて補正値を算出する補正値算出手段と、導通状態を経てサンプリングした後の相関二重サンプリング回路５１２の出力である信号値ΔＶを補正する補正手段と、補正した信号値に基づいて放射線画像を生成する画像生成手段と、を備える。【選択図】図３