DETECTABILITY OF SIMULATED LOW-CONTRAST OBJECT USING COMPUTED RADIOGRAPHY : DIFFERENCES FOR INCIDENT DOSE, PRIMARY FRACTION AND CONTRAST ENHANCEMENT

Compressive Sensing and Low Contrast Detectability

Introduction: Compressive Sensing (CS) is a powerful data acquisition and reconstruction paradigm that has facilitated the substantial acceleration of several MRI applications with little compromise in image quality [1,2]. To date, the most successful applications of CS to MRI have focused on situations where the information of interest is represented by high-contrast features (e.g. contrast-en...

Radiographic Contrast-Enhancement Masks in Digital Radiography

Contrast Enhancement of Mammograms for Rapid Detection of Microcalcification Clusters

Introduction Breast cancer is one of the most common types of cancer among women.  Early detection of breast cancer is the key to reducing the associated mortality rate. The presence of microcalcifications clusters (MCCs) is one of the earliest signs of breast cancer. Due to poor imaging contrast of mammograms and noise contamination, radiologists may overlook some diagnostic signs, specially t...

The feasibility of direct treatment planning via contrast-enhanced computed tomography: an evaluation of dose differences based on the dimensional dose distribution comparison method

Background: We used a MapCHECK software-based dimensional dose distribution comparison method capable of evaluating point-to-point geometrical dose differences in volume to determine whether doses obtained from an enhanced computed tomography (CT)-based treatment plan, which better defines the target regions and organs at risk, differs from doses obtained from plain CT and then evaluated the fe...

How Different Iterative and Filtered Back Projection Kernels Affect Computed Tomography Numbers and Low Contrast Detectability.

OBJECTIVE The aim of this study was to evaluate how different iterative and filtered back projection kernels affect the computed tomography (CT) numbers and low contrast detectability. METHODS Five different scans were performed at 6 different tube potentials on the same Catphan 600 phantom using approximately the same dose level and otherwise identical settings. The scans were reconstructed ...