A fluoroscopic imaging apparatus according to the present invention controls opening and closing movement of shielding plates (19a) to (19d) so that a first preliminary image (F1) is longer in the x direction than a strip image (P1). Since the first preliminary image (F1) has a larger size than the strip image (P1), the first preliminary image (F1) contains more X-ray image information. The photographing position of the first preliminary image (F1) is adjusted so that the upper end of the first preliminary image (F1) coincides with the upper end of the photographing range of a long image (Q). This makes it possible, when a long region is set on the basis of the current first preliminary image (F1), to easily confirm without fail whether a target X-ray image is contained in the strip image. Additionally, the position of the imaging system can be immediately and accurately corrected to a position suitable as a starting position for photographing by referring to the X-ray image in the first preliminary image (F1) containing more information. Accordingly, slot radiography using the fluoroscopic imaging apparatus according to the present invention makes it possible to immediately obtain a long image suitable for diagnosis.La présente invention concerne un appareil dimagerie radioscopique qui commande le mouvement douverture et de fermeture de plaques de blindage (19a) à (19d) de sorte quune première image préliminaire (F1) soit plus longue dans la direction x quune image de bande (P1). Étant donné que la première image préliminaire (F1) a une taille plus grande que la bande (P1) dimage, la première image préliminaire (F1) contient plusieurs informations dimage radiographique. La position photographique de la première image préliminaire (F1) est ajustée de sorte que lextrémité supérieure de la première image préliminaire (F1) coïncide avec lextrémité supérieure de la plage photographique dune image longue (Q). Cela permet, lorsquune région longue est fixée sur la base de
