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Methodologic aspects of computed microtomography to monitor the development of osteoporosis in gastrectomized rats
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics.ORCID iD: 0000-0003-0209-498X
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1995 (English)In: Academic Radiology, ISSN 1076-6332, Vol. 2, no 9, 785-791 p.Article in journal (Refereed) Published
Abstract [en]

Rationale and Objectives

We investigated the methodologic development of computed microtomography (CMT) for monitoring the development of osteoporosis in male Sprague-Dawley rats.

Methods

Eight rats were gastrectomized and eight rats were sham operated. Femurs, tibias, and tails were prepared, and CMT scans with spatial resolutions of 5–500 μm were made. Bone diameters, bone areas, and moments of inertia were determined from the CMT scans. Optimal slice position and the need for spatial resolution and energy optimization for future in vivo applications were investigated.

Results

Gastrectomy caused dramatic changes in the bone architecture of the tibia and the femur. The main features were vacuolization of the bone and reduced amounts of compact bone. Although the outer diameters of tubular bones (femur and tibia) were largely unaffected, their inner diameters were greatly increased following gastrectomy. Relative bone area and moment of inertia were greatly reduced. The optimal photon energy was 12 keV.

Conclusion

It is possible to monitor gastrectomy-evoked changes in bone morphology at various sites in rats using CMT scanning. The changes are suggestive of osteoporosis. By optimizing the energy spectrum and spatial resolution, as well as choosing the proper slice position, it should be possible to keep absorbed doses low enough to avoid acute radiation injury in repeated in vivo measurements.

Place, publisher, year, edition, pages
1995. Vol. 2, no 9, 785-791 p.
Keyword [en]
Computed microtomography scanning, gastrectomy, osteoporosis, bone architecture, Sprague-Dawley rats
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-13564DOI: 10.1016/S1076-6332(05)80487-8OAI: oai:DiVA.org:liu-13564DiVA: diva2:20964
Available from: 2001-02-20 Created: 2001-02-20 Last updated: 2015-03-20
In thesis
1. Computerised Microtomography: Non-invasive imaging and analysis of biological samples, with special reference to monitoring development of osteoporosis in small animals
Open this publication in new window or tab >>Computerised Microtomography: Non-invasive imaging and analysis of biological samples, with special reference to monitoring development of osteoporosis in small animals
2001 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The use of Computerised microtomography (CμT) in biomedical research is well established, with most applications developed at synchrotron facilities. The possibility to non-invasively monitor morphological changes in biological samples, makes it an attractive technique in biomedicine. However, high absorbed doses and long examination times are a disadvantage that limits the possibilities of performing longitudinal examinations.

The aim of this work was to optimise CmT using conventional X-ray tubes for applications in non-destructive material testing and for skeleton research in small animals (rat). A calculational model of the imaging system was developed and used to optimise the relation between image quality, expressed as the signal-to-noise ratio (SNR) in detecting a contrasting detail, and imaging time in material testing. The model was modified to optimise the relation between the SNR in detecting a trabecular detail in cancelleous bone and the mean absorbed dose in spongiosa and skin for (rat) tibia and femur.

Gastrectomized Sprague-Dawley rats were used to initiate osteoporotic changes. In order to detect differences in between gastrectomized rats and controls, spatial resolutions of 150 mm or better were needed. The minimum absorbed doses in femur spongiosa at SNR = 5 were 1mGy - 700 mGy at spatial resolutions from 100 mm to10 mm. In femur skin, the corresponding minimum absorbed doses were 2 mGy - 2000 mGy. Corresponding values for tibia were 0.3 mGy - 300 mGy for both spongiosa and skin (spatial resolution of 100 mm to10 mm). Taking 0.5 Gy as the tolerance limit for the spongiosa dose, longitudinal studies with six repeated examinations will be possible at a spatial resolution of 25 mm in femur and 17 examinations in tibia.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2001. 59 p.
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 656
Keyword
Computed microtomography, CμT, signal-to-noise ratio (SNR), non-invasive monitoring, morphological changes, Gastrectomized Sprague-Dawley, osteoporosis
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-5030 (URN)91-7219-757-9 (ISBN)
Public defence
2002-01-19, Brännströms sal, Hälsouniversitetet, Campus US, Linköpings universitet, Linköping, 09:00 (English)
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Available from: 2001-02-20 Created: 2001-02-20 Last updated: 2015-03-20Bibliographically approved

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Olander, BirgerAlm Carlsson, Gudrun

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