Bente Konst

Vestfold Hospital Trust · Radiology

Purpose Photon counting CT (PCCT) holds promise for mitigating metal artifacts and can produce virtual mono‐energetic images (VMI), while maintaining temporal resolution, making it a valuable tool for characterizing the heart. This study aimed to evaluate and optimize PCCT for cardiac imaging in patients during left ventricular assistance device (L...

The main objective of this thesis was to investigate the parameters that influence image quality in planar and fluoroscopic X-ray imaging and to develop methods to assess these in daily practice for optimization and quality control. More specifically, the aims were as follows: - to develop a simple and useful method to determine whether to use an a...

This Excel file is a template for quality control and characterization of an X-ray tube to determine dose to homogenous phantom.

This is a short tutorial for the exel file related to quality control of the X-ray tube and automatic exposure control using theoretical spectra to determine air kerma and dose to a homogenous phantom.

Purpose: To develop a method to perform quality control (QC) of X-ray tubes and automatic exposure control (AEC) as a part of the QC of the radiographic and fluoroscopic X-ray system. Our aim is to verify the output from the X-ray tube by comparing the measured radiation output, or air kerma, to the theoretical output given the applied exposure se...

Purpose: This study attempted to develop a method to measure the applied recursive filtration and to determine the noise reduction of four different fluoroscopic systems. The study also attempted to elucidate the importance of considering the recursive filter for quality control tests concerning signal-to-noise ratio (SNR) or image quality. The ve...

Purpose: A contrast-detail phantom such as CDRAD is frequently used for quality assurance, optimization of image quality, and several other purposes. However, it is often used without considering the uncertainty of the results. The aim of this study was to assess two figure of merits (FOM) originating from CDRAD regarding the variations of the FOM...

Purpose: to present a new and simplified method for pixel-wise determination of the signal-to-noise ratio improvement factor KSNR of an antiscatter grid, when used with a digital imaging system. The method was based on approximations of published formulas. The simplified estimate of K(2)SNR may be used as a decision tool for whether or not to use...

Using the PGMI system in quality assurance of chest radiographs Eva Molteberg Kaasa Sykehuset i Vestfold HF, Norway Cathrine Trill Bente Konst Purpose/Objective: Our purpose was to find a practical approach for quality assurance of chest radiographs, to reduce the number of rejected chest images and provide individual feedback to radiographers. Mat...

Reject analysis can be used as a quality indicator, and is an important tool in localizing areas where optimization is required. Reducing number of rejects is important yielding reduced patient exposure and increased cost-effectiveness. To determine rejection rates and causes in direct digital radiography. Data were collected during a three-month p...