Experimental measurement of local noise power spectrum (NPS) in photon counting detector‐CT (PCD‐CT) using a single data acquisition

C Zhang, K Li, R Zhang, GH Chen - Medical physics, 2024 - Wiley Online Library
Background Accurate noise power spectra (NPS) measurement in clinical X‐ray CT exams
is challenging due to the need for repeated scans, which expose patients to high radiation …

Unbiased zero-count correction method in low-dose high-resolution photon counting detector CT

D Bushe, R Zhang, GH Chen, K Li - Physics in Medicine & …, 2023 - iopscience.iop.org
Objective. To address the zero-count problem in low-dose, high-spatial-resolution photon
counting detector CT (PCD-CT) without introducing statistical biases or degrading spatial …

Correcting statistical CT number biases without access to raw detector counts: Applications to high spatial resolution photon counting CT imaging

D Griner, N Lei, GH Chen, K Li - Medical physics, 2023 - Wiley Online Library
Background Due to the nonlinear nature of the logarithmic operation and the stochastic
nature of photon counts (N), sinogram data of photon counting detector CT (PCD‐CT) are …

Existence, uniqueness, and efficiency of numerically unbiased attenuation pathlength estimators for photon counting detectors at low count rates

SS Hsieh, PL Rajbhandary - Medical physics, 2024 - Wiley Online Library
Background The first step in computed tomography (CT) reconstruction is to estimate
attenuation pathlength. Usually, this is done with a logarithm transformation, which is the …

Empirical unbiased zero-count correction in photon counting CT

D Bushe, R Zhang, GH Chen… - Medical Imaging 2023 …, 2023 - spiedigitallibrary.org
The correction of zero-counts is essential to enable high-quality and accurate low-dose
photon counting detector CT (PCD-CT) imaging. Prior to logarithmic normalization, it is …

Addressing the challenge of CT number bias in low-dose photon counting CT without access to raw detector count data

D Griner, N Lei, GH Chen, K Li - Medical Imaging 2023 …, 2023 - spiedigitallibrary.org
In recent years there has been increased focus on further reducing radiation dose in CT with
photon counting CT using solid-state direct-conversion photon counting detectors (PCDs) to …