Analysis of the spatial-frequency-dependent DQE of optically coupled digital mammography detectors.

Fundamental x-ray interaction limits in diagnostic imaging detectors: frequency-dependent Swank noise.

A frequency-dependent x-ray Swank factor based on the "x-ray interaction" modulation transfer function and normalized noise power spectrum is determined from a Monte Carlo analysis. This factor was calculated in four converter materials: amorphous silicon (a-Si), amorphous selenium (a-Se), cesium iodide (CsI), and lead iodide (PbI2) for incident photon energies between 10 and 150 keV and variou...

Digital Mammography: From Physical Performance Evaluation To Image Quality Analysis

Since the early 1990s digital X-ray detectors have been used extensively for medical imaging applications, such as Mammography, General Radiography, Computed Tomography, Tomosynthesis, Fluoroscopy, etc. The quality of a radiograph needs to be adequate to provide the required information for a given task. The primary physical parameters that affect image quality are spatial resolution, noise, an...

Distinguishing the indistinguishable : Identification of signal aliasing with a novel x - ray detector design for improving image signal - to - noise ratio

Introduction: Breast cancer is the most prevalent type of cancer and the second leading cause of mortality amongst Canadian women [1]. Regular mammography screening is currently the best method of early detection. Recently, a 10-year study of the Ontario Breast Screening Program revealed that not all screening centers are the same [2]. In particular, sites with digital x-ray detectors that acqu...

Calculation and analysis of DQE for some image detectors in mammography

Direct Conversion CdZnTe and CdTe Detectors for Digital Mammography

Hybrid CdZnTe and CdTe pixel detector arrays with 50 50 micron pixel sizes that convert x-rays directly into charge signals are under development at NOVA for applications to digital mammography. CdZnTe and CdTe have superior x-ray quantum efficiency compared to either emulsion-based film, phosphor-based detectors or other low-Z, solid-state detectors such as silicon. In this paper, latest resul...