Computation method and system for CT (Computed Tomography) angiography parameters
A technique of angiography and calculation method, applied in the field of medical diagnosis, to achieve the effect of reducing health hazards and allergy risks, reducing dependence, and using less dosage
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Embodiment 1
[0129] The inventors of the present application found in the clinical trials based on the low-dose method CT angiography technology that: when a sufficient amount of contrast agent (for example: 350mgI / ml specification contrast agent, inject 15-20ml contrast agent+normal saline 20 with the same flow rate, ~30ml) for the pre-test of contrast agent bolus injection, when the ROI in the blood vessel at the monitoring level is ideally located, the time-density curve (TDC) obtained will show a better linearity ( Figure 1-2 ), that is, the growth rate of the CT value measured at each sampling point after the slow growth period and before the peak value is basically stable with the decrease rate of each point before the peak value drops to the slow decline period, and the rising and falling curves are basically a linear function distribution, the average growth rate and average decline rate ( image 3 ). Combined with this finding, according to the analysis of the pharmacokinetic ch...
Embodiment 2
[0261] The computing system of CT angiography parameter of the present invention comprises:
[0262] The point collection unit is used to collect the peak point, at least one point on the ascending section, and at least one point on the descending section from the TDC curve of the bolus injection pre-test, and obtain the CT value and time corresponding to each point;
[0263] The calculation unit is used to collect the parameters according to the point collection unit, based on the theory: for a formal scan, if the contrast agent is continuously injected at the same flow rate as the bolus pre-test, the concentration of the contrast agent at a certain position in the blood vessel will appear The average rise rate and fall rate of CT value consistent with the low-dose test were calculated to obtain the delay time and contrast agent dosage required for the formal scan.
[0264] In a preferred example, the calculation system of the CT angiography parameters is also provided with a...
Embodiment 3
[0274] CT scanning system of the present invention comprises:
[0275] CT scan equipment, for obtaining CT scan images;
[0276] CT contrast agent, used to improve the visibility of CT scan images of target blood vessels;
[0277] The processor is used to execute the calculation method of the CT angiography parameters of the present invention, the calculation method includes: the time density curve of the region of interest obtained according to the pre-test of the contrast agent bolus injection, based on the theory: for the formal scan, as with If the contrast agent is continuously injected at the same flow rate as the bolus pre-test, the concentration of the contrast agent at a certain position in the blood vessel will show the same rising and falling rates of CT values as in the small dose test, through the rise and fall of the time-density curve Calculate the rising rate and falling rate of CT value at the segmental sampling point, and combine the CT value and time of t...
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