US 12,714,385 B2 · Systems and methods for imaging device calibration through analytical correction of channelized hotelling observer metrics

Abstract

Systems and methods are disclosed for calibrating imaging devices through analytical correction of Channelized Hotelling Observer (CHO) metrics. The disclosed method corrects both finite-sample bias and residual no-signal bias in a single correction step, enhancing the calibration of medical imaging devices. The correction is based on the median of the noncentral F cumulative distribution function applied to the uncorrected d′ value. This approach provides a more accurate and reliable d′ value than conventional methods, which typically address only one type of bias and rely on statistical estimation of correction factors. The disclosed method is computationally efficient, rapidly computed without processing a large number of images. This enables faster and more accurate calibration of imaging system devices, facilitating improved performance and potentially enhancing diagnostic capabilities in medical imaging applications. The method can be applied to various imaging modalities, including CT, MRI, and X-ray systems.

Claims20

Dependent claims

A method for calibrating an imaging system, comprising:

initializing imaging system parameters;
selecting channels based on the initialized imaging system parameters;
acquiring a plurality of noise images using the imaging system parameters;
acquiring a plurality of signal images using the imaging system parameters;
correcting non-uniformities present in the plurality of noise images and the plurality of signal images;
determining an uncorrected detectability index (d′) for the imaging system based on the corrected plurality of noise images, the corrected plurality of signal images, and the channels;
correcting the uncorrected d′ based on a median of an F-distribution of the uncorrected d′ to obtain a corrected d′;
comparing the corrected d′ to a predetermined threshold;
and
adjusting the imaging system parameters based on the comparison of the corrected d′ to the predetermined threshold.

7 more elements

An imaging system, comprising:

a memory storing instructions;
an imaging device;
and
a processor communicably coupled to the memory and the imaging device, wherein the processor is configured to execute the instructions to:
initialize imaging system parameters for the imaging device;
select channels based on the initialized imaging system parameters;
acquire a plurality of noise images and a plurality of signal images using the imaging system parameters;
correct non-uniformities present in the acquired plurality of noise images and the plurality of signal images;
determine an uncorrected detectability index (d′) for the imaging system based on the corrected plurality of noise images, the corrected plurality of signal images, and the channels;
correct the uncorrected d′ based on a median of an F-distribution of the uncorrected d′ to obtain a corrected d′;
compare the corrected d′ to a predetermined threshold;
and
adjust the imaging system parameters based on the comparison of the corrected d′ to the predetermined threshold.

10 more elements

Dependencies are inferred from the claim text.

Systems and methods for imaging device calibration through analytical correction of channelized hotelling observer metrics

Life of this patent

Systems and methods for imaging device calibration through analytical correction of channelized hotelling observer metrics

Life of this patent

Abstract

Claims20