US 5,664,001 AGranted

Medical X-ray imaging apparatus

AssigneesJ. Morita Manufacturing Corporation, Hamamatsu Photonics K.K.

InventorsAkifumi Tachibana, Keisuke Mori, Masakazu Suzuki, Kazunari Matoba, Hitoshi Asai, Toshitaka Takeguchi, Kazuhisa Miyaguchi

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Abstract

A medical X-ray imaging apparatus is provided, which comprises an X-ray source, an X-ray imaging device for detecting an image of X-rays having passed through a subject and a swivel member for-rotating the X-ray source and the X-ray imaging device around the subject. The X-ray imaging device comprises a CCD sensor for performing the TDI operation and a dosage sensor for detecting X-rays having passed. Dosage signal Y and transfer speed signal X corresponding to the frequency of a false vertical transfer clock are supplied to a divider, and control signal Z is outputted. When control signal Z is supplied to an X-ray control circuit via a delay circuit, the X-ray irradiation dosage of the X-ray source can be feedback-controlled properly.

Claims6

Dependent claims

A medical X-ray imaging apparatus comprising:

an X-ray generator for emitting X-rays toward a subject;
an X-ray imaging device for detecting an image of X-rays having passed through the subject;
a swivel member for rotating the X-ray generator and the X-ray imaging device that are opposed to each other around the subject;
and
display means for displaying an image signal from the X-ray imaging device,
wherein the X-ray imaging device includes a CCD sensor having a plurality of light-receiving pixels arranged in two dimensions and the frequency of a charge transfer clock is changed depending on the rotation speed of the swivel member to perform imaging of a predetermined tomographic plane, and the X-ray imaging device further includes a dosage sensor for detecting an X-ray dosage having passed the subject, and the dosage sensor is provided adjacent to the CCD sensor forward in the rotation direction of the CCD sensor to perform feedback-control of the X-ray dosage emitted by the X-ray generator.

3 more elements

Dependencies are inferred from the claim text.