Author pages are created from data sourced from our academic publisher partnerships and public sources.
Share This Author
Using 80 kVp versus 120 kVp in perfusion CT measurement of regional cerebral blood flow.
- M. Wintermark, P. Maeder, +4 authors R. Meuli
- MedicineAJNR. American journal of neuroradiology
- 1 November 2000
It is concluded that 80 kVp acquisition of perfusion CT studies of r CBF will result in increased contrast enhancement and should improve rCBF analysis, with a reduced patient's irradiation.
How to set up and apply reference levels in fluoroscopy at a national level
A nationwide survey was launched to investigate the use of fluoroscopy and establish national reference levels (RL) for dose-intensive procedures, and a wide variability was found for several types of examinations, mainly complex ones.
Quality assurance of the EORTC radiotherapy trial 22931 for head and neck carcinomas: the dummy run.
- J. Valley, J. Bernier, +4 authors R. Mirimanoff
- MedicineRadiotherapy and oncology : journal of the…
- 1 April 1998
PURPOSE A dummy run was organized to test the compliance of participating centres with the guidelines of EORTC protocol 22931, which compares high dose radiotherapy with concomitant radiochemotherapy…
Management of patient dose and image noise in routine pediatric CT abdominal examinations
- F. Verdun, D. Lepori, P. Monnin, J. Valley, P. Schnyder, F. Gudinchet
- MedicineEuropean Radiology
- 13 January 2004
The proposed method allows patient dose and image noise to be controlled in such a way that dose reduction does not impair the detection of low-contrast lesions and can be reduced if only high- Contrast organs are assessed.
Diagnostic and interventional radiology: a strategy to introduce reference dose level taking into account the national practice.
The purpose of this study is to present a strategy to define the reference dose levels for fluoroscopic, dose-intensive examinations, and the values obtained are generally higher than the ones available in the literature.
Estimation of the noisy component of anatomical backgrounds.
- F. Bochud, J. Valley, F. Verdun, C. Hessler, P. Schnyder
- Physics, MedicineMedical physics
- 1 July 1999
The goal of this study was to demonstrate the importance of variations in background anatomy by quantifying its effect on a series of detection tasks and to indicate that the tradeoff between dose and image quality might be optimized by accepting a higher system noise.
NATION-WIDE SURVEY ON RADIATION DOSES IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY IN SWITZERLAND IN 1998
It is shown that about 9.5 million diagnostic and interventional examinations are performed annually in Switzerland and that the associated annual collective dose is of the order of 7100 person.
Performance comparison of an active matrix flat panel imager, computed radiography system, and a screen-film system at four standard radiation qualities.
- P. Monnin, D. Gutierrez, S. Bulling, D. Lepori, J. Valley, F. Verdun
- Medicine, PhysicsMedical physics
- 1 February 2005
The practice of users to increase beam energy when switching from a screen-film system to a CR system, in order to improve the compromise between patient dose and image quality, might not be appropriate when switched from screen- film to selenium-based DR systems.
Calibration of ionization chambers in air kerma length.
Pencil ionization chambers are employed for the direct determination of the computed tomography dose index (CTDI), which is used for patient dosimetry in CT examinations and it is shown that the best irradiation length is 50% of the chamber rated length.
X-ray imaging of the chest in Switzerland in 1998: a nationwide survey
- A. Aroua, R. Bize, I. Buchillier-Decka, J. Vader, J. Valley, P. Schnyder
- MedicineEuropean Radiology
- 1 June 2003
The frequency and dosimetric aspects associated with chest radiography, chest CT, and photofluorography in Switzerland are investigated and the Swiss figures are compared with those of other countries of similar health care level.