Publications by authors named "Lionel Desponds"
Article Synopsis
- Channelized Hotelling observers (CHO) effectively simulate human visual performance in medical imaging detection tasks, but they can be skewed by statistical biases related to zero-signal scenarios and small sample sizes.
- A method to correct these biases and the asymmetry of confidence intervals (CIs) was investigated, using simulations with various image sizes and noise levels.
- The use of median values proved effective for accurate correction, especially at low signal levels, and yielded results that closely matched extrapolated values, thus providing a reliable adjustment for CHO biases.
Modern fluoroscopes used for image guidance have become quite complex. Adding to this complexity are the many regulatory and accreditation requirements that must be fulfilled during acceptance testing of a new unit. Further, some of these acceptance tests have pass/fail criteria, whereas others do not, making acceptance testing a subjective and time-consuming task.
View Article and Find Full Text PDFPurpose: The authors describe a design for prepatient region of interest attenuators (ROIAs) to reduce dose area product (DAP) for clinical use. The authors describe a model to predict DAP values from x-ray technique parameters recorded during a clinical procedure for image sequences obtained in the presence or absence of ROIAs. The model was developed primarily to determine what the DAP to a patient undergoing cardiac catheterization with a ROIA would have been if no ROIA had been used allowing a determination of DAP reduction.
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