Scanning dose modulation method and device

Abstract

The invention discloses a scanning dose modulation method. The scanning dose modulation method comprises the steps of obtaining attenuation information of a first XY scanning section under different projection positions of a first Z position in a planned scanning sequence according to scanned sequential data of a patient and modulating the scanning dose under a corresponding projection position according to the attenuation information, wherein the first Z position is a position in the Z direction, the Z direction is the direction from the head to the feet of a patient or the direction from the feet to the head of the patient, and the first XY scanning section is a patient section which is perpendicular to the Z direction at the first Z position. The invention also discloses a scanning dose modulation device.

Description

Technical field [0001] The present invention relates to the field of medical technology, in particular to a method and device for modulating scanning dose. Background technique [0002] Computed Tomography (CT) technology has been widely used in the field of medical technology. Different scanning dose modulation methods will directly affect the image quality of the scanned part, and even excessive scanning dose may damage the patient's body. [0003] Among them, the existing scanning dose modulation method is based on the patient's body shape, the attenuation information at different positions in the patient's Z direction (the vertical axis defined by human anatomy), and the scan sections at different positions in the patient's Z direction are approximately elliptical, but, The ratio of the long and short axis of the ellipse is set based on empirical values. Due to individual differences in patients, this approximation is inaccurate, which may make the dose value at a certain momen...

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Problems solved by technology

[0002] Computed Tomography (CT) technology has been widely used in the field of medical technology. Different scanning dose modulation methods will directly affect the image quality of the scanned part, and even cause excessive scanning dose to damage the patient's body.

[0003] Among them, the existing scan dose modulation method is to approximate the scan section at different positions in the patient's Z direction to an ellipse according to the patient's body shape and the attenuation information at different positions in the patient's Z direction (the vertical axis defined by human anatomy). However, The ratio of the long and short axes of the ellipse is set based on empirical values. Due to individual differences in patients and other reasons, this approximation is inaccurate, which may make the dose value at a certain moment during the dose modulation process too large or too small, which in turn affects Image reconstruction quality, even exposing patients to excessive radiation doses

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