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Titolo:
SWITCHING FROM DXA PENCIL-BEAM TO FAN-BEAM .2. STUDIES IN-VIVO
Autore:
EIKEN P; KOLTHOFF N; BARENHOLDT O; HERMANSEN F; NIELSEN SP;
Indirizzi:
HILLEROD SYGEHUS,DEPT CLIN PHYS,HELSEVEJ 2 DK-3400 HILLEROD DENMARK HILLEROD SYGEHUS,DEPT CLIN PHYS DK-3400 HILLEROD DENMARK
Titolo Testata:
Bone
fascicolo: 6, volume: 15, anno: 1994,
pagine: 671 - 676
SICI:
8756-3282(1994)15:6<671:SFDPTF>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Keywords:
SPINE; BONE DENSITOMETRY; DUAL X-RAY ABSORPTIOMETRY; BONE MINERAL CONTENT; BONE MINERAL DENSITY; CROSSCALIBRATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
10
Recensione:
Indirizzi per estratti:
Citazione:
P. Eiken et al., "SWITCHING FROM DXA PENCIL-BEAM TO FAN-BEAM .2. STUDIES IN-VIVO", Bone, 15(6), 1994, pp. 671-676

Abstract

Switching from the Hologic QDR-1000/W to the QDR-2000 DXA densitometer was critically evaluated with regard to cross-calibration and dosimetry. Studies with bone equivalent humanoid spine phantoms and patient studies were done. Fan-beam scanning with the QDR-2000 is problematic because of magnification. Mean phantom bone mineral content (BMC) and bone mineral density (BMD) were moderately but significantly different. Biological variation disguised differences between the two devices in humans, but significant differences were revealed when individual data were analyzed. Longitudinal assessments of BMC and BMD, initiated with QDR-1000/W and continued with the QDR-2000, should employ single-beam mode only and not fan-beam mode-but even if that is done, significant errors can be introduced. The new QDR-2000 should be properly cross-calibrated with the original densitometer, and one should make sure that the same software, phantom, and type of collimator are used. The radiation dose is substantially higher with QDR-2000 (fan-beam and high-resolution array mode) than with QDR-1000/W (pencil-beam mode) and QDR-2000 (pencil beam mode), and higher than claimed by the manufacturer. The typical radiation dose given by the manufacturer was half the actual radiation dose measured (e.g., for fan beam scan 62 mu Sv versus33 mu Sv). High-resolution array mode does not improve precision, butaugments the radiation dose to the patient.

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Documento generato il 27/10/20 alle ore 14:09:20