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welfare. 5 Computed tomography is a noninvasive technique that is commonly used to quantitatively assess bone quality in poultry. 6 Previously reported CT measures of bone quality include BMD of the sternal carina (keel bone), tibiotarsus, femur, and

Open access
in American Journal of Veterinary Research

radiology techniques in treatment of acetabular fractures . Iowa Orthop J 2001 ; 21 : 20 – 24 . 14. Lopez MJ Davis KM Jeffrey-Borger SL , et al. Interobserver repeatability of measurements on computed tomography images of lax canine hip joints

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in American Journal of Veterinary Research

AT , Upjohn MM , Schlegl K , Kneissl S , Lamb CR . Computed tomography variations in morphology of the canine atlas in dogs with and without atlantoaxial subluxation . Vet Radiol Ultrasound . 2010 ; 51 ( 6 ): 596 – 600 . 3. Gonschorek

Open access
in American Journal of Veterinary Research

Abstract

Objective—To validate mutual information criterion as a ready-to-use technique for automated alignment (ie, registration) of 3-dimensional (3-D) multimodal image data of the head of cats and dogs.

Sample Population—Corresponding 3-D magnetic resonance imaging (MRI) and computed tomography (CT) brain scans of a 6-month-old Doberman Pinscher with a brain cyst; CT images of the head of a European shorthair cat with a meningioma before and immediately, 3, and 6 months after surgical resection; and CT and corresponding stacked anatomic cryosection images of the entire head of a 2-year-old sexually intact female Beagle.

Procedure—All images were matched retrospectively by use of an in-house computer program developed on the basis of a mutual information image registration algorithm. Accuracy of the resulting registrations was evaluated by visual inspection.

Results—All registrations were judged to be highly accurate. Additional manual corrections were not necessary.

Conclusions and Clinical Relevance—Mutual information registration criterion can by applied to 3-D multimodal head images of cats and dogs for full automatic rigid-body image registration. The combination of such aligned images would considerably facilitate efforts of veterinary clinicians as indicated by its widespread use in brain surgery and radiation therapy of humans. (Am J Vet Res 2004;65:1680–1687)

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in American Journal of Veterinary Research

on computed tomography (CT) scans and positive cutaneous keratin ET qPCR. The remaining 3 turtles tested positive for ET via cutaneous keratin qPCR and had mild defects on the carapace and plastron confirmed on CT scans. These animals had received

Open access
in American Journal of Veterinary Research

Veterinary and Life Science University. Sample preparation Computed tomography a and MRI b images of all vertebral specimens were obtained and used to evaluate vertebral morphology and intervertebral disk hydration. Then, 3-D CT reconstruction

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in American Journal of Veterinary Research

stability by penetrating more of the cortices. A safe corridor for screw insertion was established by use of computed tomography in another study 12 conducted by our research group, but biomechanical testing has not been performed. The best comparison for

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in American Journal of Veterinary Research

euthanatized for reasons unrelated to the present study were obtained and stored at–25 °C. Computed tomography a and MRI b of each specimen were performed to evaluate the bony and ligamentous structures of the occipitoatlantoaxial junction and allow exclusion

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in American Journal of Veterinary Research

W is weight in grams and K is a species-specific constant determined by the shape of the species. 5 The use of computed tomography (CT) to determine a species specific K constant has been described in ferrets ( Mustela putorius furo ), 6 rabbits

Open access
in American Journal of Veterinary Research

Abstract

Objective—To optimize the use of CT-guided modeling for the calculation of body surface area (BSA) in domestic rabbits (Oryctolagus cuniculus).

Animals—12 domestic rabbits.

Procedures—Adult rabbits (body weight, 1 to > 4 kg) that were client-owned animals undergoing CT for disease diagnosis or deceased laboratory animals donated from other research projects were scanned with a CT scanner. Images were transferred to a radiation therapy planning software program. Image slices were captured as contiguous slices at 100 kVp and 100 mA and processed to 0.1-cm-thick sections. The length of each contoured slice was summed to calculate a final BSA measurement. Nonlinear regression analysis was then used to derive an equation for the calculation of BSA in rabbits.

Results—The constant calculated by use of this method was 9.9 (range, 9.59 to 10). The R 2 for the goodness of fit was 0.9332. The equation that best described BSA as a function of body weight for domestic rabbits with this method was as follows: BSA = (9.9 × [body weight {in grams}]2/3)/10,000.

Conclusions and Clinical Relevance—The BSA calculated via the CT-guided method yielded results similar to those obtained with equations for other similarly sized mammals and verified the use of such equations for rabbits. Additionally, this technique can be used for species that lack equations for the accurate calculation of BSA.

Full access
in American Journal of Veterinary Research