Comparison of ghosting effects for three commercial a-Si EPIDs.

Marcel Van Herk; L N McDermott; S M J J G Nijsten; J-J Sonke; M Partridge; M van Herk; B J Mijnheer

Comparison of ghosting effects for three commercial a-Si EPIDs.

Marcel Van Herk, L N McDermott, S M J J G Nijsten, J-J Sonke, M Partridge, M van Herk, B J Mijnheer

Research output: Contribution to journal › Article › peer-review

Abstract

Many studies have reported dosimetric characteristics of amorphous silicon electronic portal imaging devices (EPIDs). Some studies ascribed a non-linear signal to gain ghosting and image lag. Other reports, however, state the effect is negligible. This study compares the signal-to-monitor unit (MU) ratio for three different brands of EPID systems. The signal was measured for a wide range of monitor units (5-1000), dose-rates, and beam energies. All EPIDs exhibited a relative under-response for beams of few MUs; giving 4 to 10% lower signal-to-MU ratios relative to that of 1000 MUs. This under-response is consistent with ghosting effects due to charge trapping.

Original language	English
Journal	Medical Physics
Volume	33
Issue number	7
Publication status	Published - Jul 2006

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title = "Comparison of ghosting effects for three commercial a-Si EPIDs.",

abstract = "Many studies have reported dosimetric characteristics of amorphous silicon electronic portal imaging devices (EPIDs). Some studies ascribed a non-linear signal to gain ghosting and image lag. Other reports, however, state the effect is negligible. This study compares the signal-to-monitor unit (MU) ratio for three different brands of EPID systems. The signal was measured for a wide range of monitor units (5-1000), dose-rates, and beam energies. All EPIDs exhibited a relative under-response for beams of few MUs; giving 4 to 10% lower signal-to-MU ratios relative to that of 1000 MUs. This under-response is consistent with ghosting effects due to charge trapping.",

author = "{Van Herk}, Marcel and McDermott, {L N} and Nijsten, {S M J J G} and J-J Sonke and M Partridge and {van Herk}, M and Mijnheer, {B J}",

year = "2006",

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journal = "Medical Physics",

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T1 - Comparison of ghosting effects for three commercial a-Si EPIDs.

AU - Van Herk, Marcel

AU - McDermott, L N

AU - Nijsten, S M J J G

AU - Sonke, J-J

AU - Partridge, M

AU - van Herk, M

AU - Mijnheer, B J

PY - 2006/7

Y1 - 2006/7

N2 - Many studies have reported dosimetric characteristics of amorphous silicon electronic portal imaging devices (EPIDs). Some studies ascribed a non-linear signal to gain ghosting and image lag. Other reports, however, state the effect is negligible. This study compares the signal-to-monitor unit (MU) ratio for three different brands of EPID systems. The signal was measured for a wide range of monitor units (5-1000), dose-rates, and beam energies. All EPIDs exhibited a relative under-response for beams of few MUs; giving 4 to 10% lower signal-to-MU ratios relative to that of 1000 MUs. This under-response is consistent with ghosting effects due to charge trapping.

AB - Many studies have reported dosimetric characteristics of amorphous silicon electronic portal imaging devices (EPIDs). Some studies ascribed a non-linear signal to gain ghosting and image lag. Other reports, however, state the effect is negligible. This study compares the signal-to-monitor unit (MU) ratio for three different brands of EPID systems. The signal was measured for a wide range of monitor units (5-1000), dose-rates, and beam energies. All EPIDs exhibited a relative under-response for beams of few MUs; giving 4 to 10% lower signal-to-MU ratios relative to that of 1000 MUs. This under-response is consistent with ghosting effects due to charge trapping.

M3 - Article

C2 - 16898447

SN - 0094-2405

VL - 33

JO - Medical Physics

JF - Medical Physics

IS - 7

ER -

Comparison of ghosting effects for three commercial a-Si EPIDs.

Abstract

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