Article (Scientific journals)
Hot and cold contrasts in high resolution Tc-99m planar scintigraphy: a survey of fifty-two camera heads using the PICKER thyroid phantom
Seret, Alain
2010In Physica Medica, 26 (3), p. 166-172
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Keywords :
Gamma-camera; Quality control; Static mode; Picker thyroid phantom; High resolution collimator; Technetium-99m; Contrast; Sensitivity
Abstract :
[en] This study aimed at comparing the sensitivity and hot and cold contrasts obtained when imaging the Picker thyroid phantom using gamma cameras fitted with either their ultra-high or high-resolution low energy parallel hole collimator. Seventeen camera models from Elscint, General Electric, Siemens and Sopha Medical Vision were involved in the study for a total of 30 cameras and 52 camera heads. A single operator conducted the study in order to minimize the impact of human factors. The phantom contained about 74 MBq 99mTc and was imaged at 10-cm from the collimator face with the energy window recommended by the camera manufacturer. A total of 1 million counts were accumulated. Hot and cold contrasts were in mean about 0.05 higher when using an ultra-high-resolution than when using a high-resolution low energy collimator. This higher contrast was obtained at the expense of a mean reduction in sensitivity of 30%. In particular, Elscint cameras demonstrated a 30% lower sensitivity whatever the collimator type. The Sopha Medical Vision DST and DSX cameras and the General Electric Magicam camera offered the lowest contrasts among the cameras with a high-resolution collimator. Although this was accompanied by a higher than the mean sensitivity for the DST and DSX, the Magicam demonstrated sensitivity roughly identical to the mean of all the cameras with a high-resolution collimator.
Disciplines :
Radiology, nuclear medicine & imaging
Author, co-author :
Seret, Alain ;  Université de Liège - ULiège > Département de physique > Imagerie médicale expérimentale
Language :
English
Title :
Hot and cold contrasts in high resolution Tc-99m planar scintigraphy: a survey of fifty-two camera heads using the PICKER thyroid phantom
Publication date :
2010
Journal title :
Physica Medica
ISSN :
1120-1797
eISSN :
1724-191X
Publisher :
Istituti Editoriali e Poligrafici Internazionali, Italy
Volume :
26
Issue :
3
Pages :
166-172
Peer reviewed :
Peer reviewed
Available on ORBi :
since 24 June 2010

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