PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus which can greatly reduce a photographic data amount, and can provide a medical image with high definition.SOLUTION: The X-ray CT apparatus includes: a rotating unit on which an X-ray tube is arranged to be rotatable around a subject a rotation control unit which controls the rotation of the rotating unit a fixing unit that supports the rotational movement of the rotating unit a light transmission/reception unit which is an LED and a PD arranged to make the fixing unit and the rotating unit mutually communicable a fixing unit side controller and a rotating unit side controller that execute a communication test schedule of the light receiving unit an LED driving current changeable unit that changes transmission output of the fixing unit side light transmission/reception unit and the rotating unit side light transmission/reception unit within a regulated range according to the communication test schedule: a PD amplifier amplification factor changeable unit that changes reception sensitivity of the fixing unit side light transmission/reception unit and the rotating unit side light transmission/reception unit within a regulated range according to the communication test schedule and a communication abnormality detector that detects a communication error of the light transmission/reception unit by the communication test.COPYRIGHT: (C)2013,JPO&INPIT【課題】撮影データ量の大幅な低減と、医用画像の高精細化が可能なX線CT装置を提供すること。【解決手段】実施形態のX線CT装置は、X線管が被検体を中心に回転可能に配置された回転部と、前記回転部の回転を制御する回転制御部と、前記回転部の回転運動を支える固定部と、固定部と回転部が相互通信可能にLEDとPDが配置された光送受信部と、前記光受信部の通信テストスケジュールを実行する固定部側制御部および回転部側制御部と、前記通信テストスケジュールに従って、前記固定部側および回転部側光送受信部の送信出力を規定の範囲内で可変するLED駆動電流可変部と、前記通信テストスケジュールに従って、前記固定部側および回転部側光送受信部の受信感度を規定の範囲内で可変するPDアンプ増幅率可変部と、前記通信テストで前記光送受信部の通信エラーを検出する通信異常検出部と、を有する。【選択図】図2
