| 摘要 |
Systems and methods are described for determining a minimum radiation dose for a computed tomography (CT) scanning device. The method includes receiving a first input indicative of a selected minimum detectable contrast and a second input indicative of an estimate of a size of a subject to be exposed to the radiation dose. A minimum radiation dose to be applied via a radiation source is determined. The minimum radiation dose is determined at least in part by a power law model relating the size of the subject, a lesion size, and a minimum detectable contrast. The power law model is defined as MDC=A(L) dB(L) DoseC(L), wherein (i) MDC is the selected minimum detectable contrast, (ii) d is lesion size, (iii) Dose is radiation dose, (iv) A(L), B(L), and C(L) are pre-determined fitted parameters, and (v) L is the estimate of the size of the subject. |
| 主权项 |
1. A computed tomography (CT) imaging system for imaging a body region of a subject, the system comprising:
CT scanner circuitry including one or more processing units and one or more memory devices, the one or more memory devices storing instructions that, when executed by at least one of the one or more processing units, cause the CT scanner circuitry to implement the acts of:
receiving first input data indicative of a lesion size of interest,receiving second input data indicative of a predetermined minimum detectable contrast (MDC),receiving third input data associated with a size of a subject being imaged,determining a value for the size of the subject based on the received third input data, anddetermining a radiation dose to apply to the subject, the determining of the radiation dose based on a power law model relating size of the subject, lesion size, and minimum detectable contrast, the power law model defined as MDC=A(L)dB(L)DoseC(L), wherein (i) MDC is the predetermined minimum detectable contrast, (ii) d is the lesion size, (iii) Dose is radiation dose, (iv) A(L), B(L), and C(L) are pre-determined fitted parameters for the CT imaging system, and (v) L is the determined value for the size of the subject; a radiation source configured to rotate about the body region of the subject, the radiation source configured to emit the determined radiation dose; and a radiation detector for sensing radiation doses emitted from the radiation source, the detector generating electronic signals in response to the sensed radiation doses, the electronic signals representing image data received by the CT scanner circuitry and used to generate an image of at least a portion of the body region of the subject. |
