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Title: An image quality comparison of standard and dual-side read CR systems for pediatric radiology

Abstract

An objective analysis of image quality parameters was performed for a computed radiography (CR) system using both standard single-side and prototype dual-side read plates. The pre-sampled modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE) for the systems were determined at three different beam qualities representative of pediatric chest radiography, at an entrance detector air kerma of 5 {mu}Gy. The NPS and DQE measurements were realized under clinically relevant x-ray spectra for pediatric radiology, including x-ray scatter radiations. Compared to the standard single-side read system, the MTF for the dual-side read system is reduced, but this is offset by a significant decrease in image noise, resulting in a marked increase in DQE (+40%) in the low spatial frequency range. Thus, for the same image quality, the new technology permits the CR system to be used at a reduced dose level.

Authors:
; ; ; ; ; ;  [1];  [2];  [3];  [2];  [4];  [5]
  1. University Institute for Applied Radiophysics (IRA), 1007 Lausanne (Switzerland)
  2. (Inselspital), 3010 Bern (Switzerland)
  3. (Germany)
  4. (CHUV), 1011 Lausanne (Switzerland)
  5. (IRA), 1007 Lausanne (Switzerland)
Publication Date:
OSTI Identifier:
20775067
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 33; Journal Issue: 2; Other Information: DOI: 10.1118/1.2163392; (c) 2006 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; BIOMEDICAL RADIOGRAPHY; CHEST; COMPARATIVE EVALUATIONS; COMPUTERIZED TOMOGRAPHY; FREQUENCY RANGE; IMAGES; KERMA; NOISE; QUANTUM EFFICIENCY; RADIATION DOSES; X RADIATION; X-RAY SPECTRA

Citation Formats

Monnin, P., Holzer, Z., Wolf, R., Neitzel, U., Vock, P., Gudinchet, F., Verdun, F.R., Institute for Paediatric Radiology-University Hospital of Bern, Philips Medical Systems DMC GmbH, 22335 Hamburg, Institute for Paediatric Radiology-University Hospital of Bern, University Hospital Center, and University Institute for Applied Radiophysics. An image quality comparison of standard and dual-side read CR systems for pediatric radiology. United States: N. p., 2006. Web. doi:10.1118/1.2163392.
Monnin, P., Holzer, Z., Wolf, R., Neitzel, U., Vock, P., Gudinchet, F., Verdun, F.R., Institute for Paediatric Radiology-University Hospital of Bern, Philips Medical Systems DMC GmbH, 22335 Hamburg, Institute for Paediatric Radiology-University Hospital of Bern, University Hospital Center, & University Institute for Applied Radiophysics. An image quality comparison of standard and dual-side read CR systems for pediatric radiology. United States. doi:10.1118/1.2163392.
Monnin, P., Holzer, Z., Wolf, R., Neitzel, U., Vock, P., Gudinchet, F., Verdun, F.R., Institute for Paediatric Radiology-University Hospital of Bern, Philips Medical Systems DMC GmbH, 22335 Hamburg, Institute for Paediatric Radiology-University Hospital of Bern, University Hospital Center, and University Institute for Applied Radiophysics. Wed . "An image quality comparison of standard and dual-side read CR systems for pediatric radiology". United States. doi:10.1118/1.2163392.
@article{osti_20775067,
title = {An image quality comparison of standard and dual-side read CR systems for pediatric radiology},
author = {Monnin, P. and Holzer, Z. and Wolf, R. and Neitzel, U. and Vock, P. and Gudinchet, F. and Verdun, F.R. and Institute for Paediatric Radiology-University Hospital of Bern and Philips Medical Systems DMC GmbH, 22335 Hamburg and Institute for Paediatric Radiology-University Hospital of Bern and University Hospital Center and University Institute for Applied Radiophysics},
abstractNote = {An objective analysis of image quality parameters was performed for a computed radiography (CR) system using both standard single-side and prototype dual-side read plates. The pre-sampled modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE) for the systems were determined at three different beam qualities representative of pediatric chest radiography, at an entrance detector air kerma of 5 {mu}Gy. The NPS and DQE measurements were realized under clinically relevant x-ray spectra for pediatric radiology, including x-ray scatter radiations. Compared to the standard single-side read system, the MTF for the dual-side read system is reduced, but this is offset by a significant decrease in image noise, resulting in a marked increase in DQE (+40%) in the low spatial frequency range. Thus, for the same image quality, the new technology permits the CR system to be used at a reduced dose level.},
doi = {10.1118/1.2163392},
journal = {Medical Physics},
number = 2,
volume = 33,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}
  • An integrated readout computed radiography system (Fuji XU-D1) incorporating dual-side imaging plates (ST-55BD) was analyzed in terms of modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE) for standard beam qualities RQA 9 and RQA 5. NPS and DQE were assessed using a detector entrance air kerma consistent with clinical practice for chest radiography. Similar investigation was performed on a standard reader (Fuji FCR 5000) using single-side imaging plates (ST-VI). Negligible differences were found between the MTFs of the two imaging systems for RQA 9, whereas for RQA 5 the single-side system exhibited slightly superior MTF.more » Regarding noise response, the dual-side system turned out to be better performing for both beam qualities over a wide range of frequencies. For RQA 9, at 8 {mu}Gy, the DQE of the dual-side system was moderately higher over the whole frequency range, whereas for RQA 5, at 10 {mu}Gy, significant improvement was found at low- and midrange frequencies. As an example, at 1 cycle/mm, the following improvements in the DQE of the dual-side system were observed: +22% (RQA 9, at 8 {mu}Gy), +50% (RQA 9, at 30 {mu}Gy), and +45% (RQA 5, at 10 {mu}Gy)« less
  • The aim of this study was to assess the potential of a modern x,y,z modulation-based automatic exposure control system (AEC) for dose reduction in pediatric and adult multidetector CT (MDCT) imaging and evaluate the quality of the images obtained. Five physical anthropomorphic phantoms that simulate the average individual as neonate, 1-, 5-, 10-year old child, and adult were scanned with a MDCT scanner, equipped with a modern AEC system. Dose reduction (%DR) was calculated as the percentage difference of the mean modulated and the preset tube current-time product that is prescribed for standard head and body scan protocols. The effectmore » of the tube potential and the orientation of the topogram acquisition on dose reduction were assessed. Image quality was evaluated on the basis of image noise and signal to noise ratio (SNR). The dose reduction values achieved in pediatric phantoms were remarkably lower than those achieved for the adult. The efficiency of the AEC is decreased at 80 kVp compared to higher tube potentials and for helical scans following an anterior posterior (AP-AEC) compared to a lateral (LAT-AEC) topogram acquisition. In AP-AEC scans, the dose reduction ranged between 4.7 and 34.7% for neonate, 15.4 and 30.9% for 1 year old, 3.1 and 26.7% for 5 years old, 1.2 and 58.7% for 10 years old, and 15.5 and 57.4% for adult. In LAT-AEC scans, the corresponding dose reduction ranged between 11.0 and 36.5%, 27.2 and 35.7%, 11.3 and 35.6%, 0.3 and 67.0%, and 15.0 and 61.7%, respectively. AP-AEC scans resulted in a 17.1% and 19.7% dose increase in the thorax of neonate and the pelvis of the 10-year old phantom, respectively. The variation in the measured noise among images obtained along the scanning z axis was lower in AEC activated compared to fixed milliamperes scans. However, image noise was significantly increased (P<.001) and SNR significantly decreased (P<.001) in most AEC activated compared to fixed milliamperes scans. In conclusion, AEC resulted in a (i) substantial dose reduction, which is less pronounced in children compared to adult, (ii) higher dose reduction in scans following a lateral compared to scans following an anterior-posterior topogram acquisition, (iii) increase of image noise and degradation of SNR in the obtained images compared to the fixed milliamperes technique.« less