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Dual Energy X-Ray Absorptiometry (DXA)
Dual Energy X-ray Absorptiometry (DXA) is a method of estimating bone mineral utilizing a pencil beam x-ray
beam filtered to provide the two distinct energy peaks necessary to distinguish bone from soft tissue.
SimulCount
TM
ensures a more accurate measure of BMD. Dual NaI scintillation crystals are used to sep-
arately detect the two x-ray energies.
The technique for separating x-ray output into two distinct energy levels is known as K-edge filtration. In K-edge
filtering, a rare earth element is placed in the beam path and x-rays are sharply attenuated at energy levels par-
ticular to that element. Norland uses samarium as the filter material because it produces energy peaks at
46.8keV and 80keV, which have proven to be most effective at differentiating between soft tissue and bone tis-
sue.
Dynamic Filtering
DynaFlux
TM
is another Norland innovation that is complementary to its pencil-beam design. Norland has
developed a method of optimizing the photon count rate for varying patient thickness by automatically selecting
the proper samarium filter combination. This filter selection feature prevents starvation or saturation of the
detector assembly.
Operator's Guide
437D140 Rev. I
2-4
General Information
Содержание Elite 437A150
Страница 1: ...DXA Bone Densitometer Operator s Guide Elite Model 437A150 Operator s Guide 437D140 Rev I...
Страница 22: ...This page intentionally left blank Operator s Guide 437D140 Rev I 1 8...
Страница 41: ...Operator s Guide 437D140 Rev I General Information 2 19 Figure 2 6 Page 2 of the Bone Exam Report...
Страница 45: ...Operator s Guide 437D140 Rev I General Information 2 23 Figure 2 10 Page 2 of the Patient Letter...
Страница 47: ...Operator s Guide 437D140 Rev I General Information 2 25 Figure 2 12 Page 2 of the Referral Letter...
Страница 49: ...Operator s Guide 437D140 Rev I General Information 2 27 Figure 2 14 Page 2 of the Ten Year Fracture Risk Report...
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Страница 66: ...11 Click Operator s Guide 437D140 Rev I 3 10 Installation and Setup...
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Страница 124: ...Sample Printed QA Results Report Operator s Guide 437D140 Rev I 4 16 Basic Operation...
Страница 137: ...Operator s Guide 437D140 Rev I Basic Operation 4 29...
Страница 165: ...Operator s Guide 437D140 Rev I Scanning Whole Body 5 23 Figure 5 6 Page 2 of the Bone Exam Report...
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Страница 176: ...Figure 6 2 Page 2 of the Bone Exam Report Operator s Guide 437D140 Rev I 6 10 Soft Tissue Composition...
Страница 178: ...Figure 6 4 Page 2 of the Body Composition Report Operator s Guide 437D140 Rev I 6 12 Soft Tissue Composition...
Страница 198: ...Operator s Guide 437D140 Rev I 7 20 Scanning AP Spine...
Страница 205: ...Operator s Guide 437D140 Rev I Scanning AP Spine 7 27 Figure 7 5 Page 2 of the Bone Exam Report...
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Страница 238: ...Figure 8 6 Page 2 of the Bone Exam Report Operator s Guide 437D140 Rev I 8 32 Scanning Hip...
Страница 289: ...Operator s Guide 437D140 Rev I Scanning Lateral Spine 10 29 Figure 10 6 Page 2 of the Bone Exam Report...
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Страница 301: ...Operator s Guide 437D140 Rev I Additional Techniques 11 11 6 The dialog box closes and the file is sent...
Страница 326: ...Operator s Guide 437D140 Rev I 11 36 Additional Techniques...
Страница 378: ...Figure 12 2 Page 1 of the Ten Year Fracture Risk Report Operator s Guide 437D140 Rev I 12 10 Ten Year Fracture Risk...
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Страница 446: ...Label Locations continued Operator s Guide 437D140 Rev I 17 18 Technical Reference...
Страница 448: ...Scanner Labels continued Operator s Guide 437D140 Rev I 17 20 Technical Reference...
Страница 449: ...Operator s Guide 437D140 Rev I Technical Reference 17 21 Scanner Labels continued...
Страница 457: ...Operator s Guide 437D140 Rev I Reference Data Sets 18 7 Excerpt from Calcified Tissue International...
Страница 458: ...Excerpt from the Journal of Bone and Mineral Research Operator s Guide 437D140 Rev I 18 8 Reference Data Sets...
Страница 459: ...Operator s Guide 437D140 Rev I Reference Data Sets 18 9...
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