Method and device for CT scanning dose modulation

Abstract

The invention discloses a method for CT scanning dose modulation. The method comprises the steps that attenuation information of a scheduled scanning sequence is obtained according to scanned sequence data of a tested body, and then dose modulation is conducted on an XY scanning fracture surface of each Z position in the scheduled scanning sequence, wherein a scanned sequence refers to a fault or spiral sequence, such as the sequence scanned earlier among multiple scanning sequences, of all or part of same scanned parts of a same tested body before current time, the Z position is one position in the Z direction, and the Z direction is the direction extending from the head of the tested body to the foot of the tested body or the direction extending from the foot of the tested body to the head of the tested body; the XY scanning fracture surface of the Z position is a tested body fracture surface which is perpendicular to the Z direction in the Z position. The invention further discloses a device for CT scanning dose modulation.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 201410665463.X and the title of the invention "a scanning dose modulation method and device" submitted to the China Patent Office on November 19, 2014, the entire contents of which are incorporated by reference in this application. technical field [0002] The present disclosure relates to the technical field of CT scanning, in particular to a method and device for dose modulation of CT scanning. Background technique [0003] 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. [0004] 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'...

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Problems solved by technology

[0003] 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.

[0004] 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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