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排序方式: 共有80条查询结果,搜索用时 15 毫秒
1.
Paul Y. Barthez DVM William J. Hornof DVM MS Larry D. Cowgill DVM PhD Larry A. Neal BS Paul Mickel 《Veterinary radiology & ultrasound》1998,39(5):470-474
The scintigraphically measured percentage dose uptake of 99m Tc-DTPA by the kidneys and the plasma clearance of 99m Tc-DTPA have been reported to correlate well with inulin clearance. These two parameters were evaluated in seven dogs with known or suspected naturally occurring renal disease and compared to simultaneously measured renal inulin clearance. Correlation between inulin clearance and the 99m Tc-DTPA plasma clearance was better ( p =.0016) than the correlation between the percentage DTPA uptake by the kidney. It was concluded that measurement of 99m Tc-DTPA plasma clearance is a more accurate method to estimate global glomerular filtration rate (GFR) than the percentage kidney uptake. 相似文献
2.
Thomas G. Nyland DVM Brett M. Kantrowitz DVM †Paul Fisher Harvey J. Olander DVM PHD‡ William J. Hornof DVM MS 《Veterinary radiology & ultrasound》1989,30(4):174-180
Canine kidney measurements were obtained in vivo using ultrasound before and after anesthesia and were compared with direct caliper measurements at laparotomy. Following excision, the kidney dimensions were also measured ultrasonically in a water bath and the results were used to calculate kidney -volume by a modified parallel planimetric method and three variations of a prolate ellipsoid method. The calculated volume was compared with actual kidney volume determined by volume displacement. All methods were found to underestimate actual volume so that a linear correction of ultrasonically calculated volume was required to predict actual volume. The modified parallel planimetric method and a prolate ellipsoid method using height and width determinations cranial and caudal to the renal pelvis were the best models. The prolate ellipsoid model was chosen for subsequent kidney volume calculations because of its simplicity. The noninvasive calculation of kidney volume using ultrasound was sufficiently accurate to be clinically useful, particularly when serially evaluating kidney size changes in the same dog. 相似文献
3.
Philip D. Doblik William J. Hornof Timothy R. O'Brien 《Veterinary radiology & ultrasound》1980,21(5):224-232
Two rare earth radiographic intensifying screen-film systems were compared with a calcium tungstate screen-film systems in a series of clinically oriented trials. The calcium tungstate screen-film system was subjectively judged to have the highest overall image quality, primarily because of its wide latitude. Several rare earth screen-film combinations produced radiographs of excellent diagnostic quality. In general, image quality was inversely related to screen-film speed, whereas radiation protection was directly related to screen-film speed. Medium-speed rare earth screen-film combinations resulted in reductios of scatter radiation on the order of 30 to 70 percent compared with the par-speed film combination. Recommendations are made regarding the use of specific rare earth intensifying screen-film combinations in small and large animal diagnostic radiography. 相似文献
4.
C P Coyne W J Hornof A B Kelly T R O'Brien S J DeNardo 《American journal of veterinary research》1985,46(12):2578-2581
Two methods were analyzed for the rapid extraction of equine fibrinogen from fresh plasma, using ammonium sulfate-sodium phosphate buffer. Fibrinogen from each of these 2 methods was then radiolabeled with 125I (half-life = 60.2 days, gamma = 35 keV), using monochloroiodine reagent. Mean protein-bound activity was 98.5% and mean clottable radioactivity was 94.1%. Radiolabeled fibrinogen administered IV to 15 horses had an overall mean (+/- SD) plasma half-life of 4.95 +/- 0.44 days. 相似文献
5.
Donald R. Trout DVM PhD William J. Hornof DVM MS Paul E. Fisher BS 《Veterinary radiology & ultrasound》1991,32(5):251-255
Soft tissue- and bone-phase scintigrams were acquired from 4 normal horses before and over a 14-day period after metacarpophalangeal, antebrachiocarpal, tarsocrural and tarsometatarsal joint blocks. Images were evaluated subjectively and quantitatively for increased activity in these regions. The antebrachiocarpal block resulted in obvious focal accumulation of activity on soft tissue-phase scintigrams. This increased activity was greatest 2 to 4 days postanesthesia and persisted up to 14 days postanesthesia. On quantitative analysis of soft tissue-phase images, similar trends were noted after the metacarpophalangeal and tarsocrural blocks, but these increases were relatively mild and were not evident on subjective evaluation of the images. Abnormal soft tissue-phase activity was not associated with the tarsometatarsal block. On bone-phase scintigrams, increased activity was not present following any of these joint blocks. 相似文献
6.
M W O'Callaghan J R Pascoe T R O'Brien W J Hornof D K Mason 《Equine veterinary journal》1987,19(5):419-422
This study was initiated to determine if the extent and intensity of lung lesions associated with exercise-induced pulmonary haemorrhage (EIPH) in horses could be predicted from thoracic radiographs. Sets of thoracic radiographs from 24 horses with varied histories of EIPH were subjectively coded for radiographic quality, and perceived extent and intensity of diffuse interstitial opacity by three radiologists who had no knowledge of the corresponding autopsy results. Codes assigned from radiographs for the chosen parameters were compared with coded estimates of lung surface staining assigned at post mortem and volume measurements of haemosiderin deposits and bronchial arterial neovascularisation recorded from lung slices in separate studies. The non-parametric Spearman rank correlation test was used to test for statistical significance. All radiographically coded estimates of lesion severity were positively correlated with post mortem measurements of actual lesion involvement, but only the correlation between coded estimates of lesion opacity versus haemosiderin deposits and bronchial artery neovascularisation were statistically significant (P less than 0.05). Correlations between radiographic codes for lesion extent versus haemosiderin deposits and neovascularisation were just beyond the level of significance (P greater than 0.05 less than 0.1). These findings indicate that there are graded, radiographically discernible increases in interstitial opacity related to actual lesion severity. However, under the conditions of the study, accurate prediction of lung pathology in individual cases based on radiographic criteria was precluded by the wide variance of the coded values. The authors believe that with good radiographic technique and careful criteria selection, satisfactory prediction of lesion severity in EIPH cases could be achieved. 相似文献
7.
Philip D. Koblik DVM William J. Hornof DVM MS Eugene M. Breznock DVM PhD 《Veterinary radiology & ultrasound》1983,24(5):232-236
Quantitative hepatic scintigraphy is a valid means for estimating total liver blood flow and relative portal hepatic perfusion. The Hepatic perfusion index (HPI) was determined for a group of 12 dogs with portosystemic shunts prior to and two days after corrective surgery. HPI values for the dogs prior to operation were significantly elevated (p<0.001) as compared with those for a group of normal dogs, indicating reduced effective portal hepatic perfusion in dogs with shunts. Dogs showing a favorable clinical response after surgery had a significant decrease (p<0.02) in HPI values after operation. One dog showing a poor clinical response after operation had an increase in HPI score after operation. Quantitative hepatic scintigraphy is a valuable diagnostic test for screening presumptive cases of portosystemic shunts and monitoring the response to surgical intervention. 相似文献
8.
S M Stover W J Hornof G L Richardson D M Meagher 《Journal of the American Veterinary Medical Association》1986,188(6):624-628
History, physical examination, and bone scintigraphy were used to diagnose central and/or third tarsal bone trauma in 3 acutely lame horses. In all 3 cases, the results of initial radiographic examination were negative. Bone scintigraphy revealed focal, intense radioisotope uptake at the level of the distal tarsal bones in the 3 horses. Radiographs obtained 4 weeks after injury in one horse demonstrated a slab fracture of the central tarsal bone. Conservative management of the tarsal bone disease resulted in acceptable return to function in all 3 horses. 相似文献
9.
10.
Erik R. Wisner DVM Alain P. Théon Dr Med Vet MS Thomas G. Nyland DVM William J. Hornof DVM MS 《Veterinary radiology & ultrasound》1994,35(1):53-58
High-resolution ultrasonography was evaluated as an alternative to 99mTcO-4 scintigraphy for examining size and appearance of thyroid glands in hyperthyroid cats. Thyroid ultrasound examinations were performed on 6 normal cats and 14 cats with hyperthyroidism. Thyroid lobe volume was estimated from ultrasound images using the equation for a prolate ellipsoid, π/6 (length * height * width). Total thyroid volume was estimated by adding the volume estimations of the left and right lobes. Thyroid lobes of hyperthyroid cats were considered abnormal if estimated volume exceeded the 99% confidence interval for normal thyroid volume determined from the control group. Scintigraphic examinations performed on hyperthyroid cats were evaluated for unilateral versus bilateral disease and for the presence of ectopic activity. Mean thyroid lobe volume and total thyroid volume for normal cats was 85 and 169 mm3, respectively. Mean thyroid lobe volume and total thyroid volume for hyperthyroid cats was 578 and 889 mm3. There was a significant difference in mean estimated total thyroid volume of normal and hyperthyroid cats. Thyroid lobes with greater than normal TcO-4 uptake on scintigraphy were larger and had variable homogeneity, echogenicity, and margination on ultrasound examination. There also was an 85.7% agreement of scintigraphy and ultrasonography in differentiating normal from abnormal thyroid lobes. A fair correlation between estimated total thyroid volume of hyperthyroid cats and most recent pretherapy serum thyroxine values were also found. This preliminary study indicates that thyroid ultrasound examination may provide information that is useful for diagnosis and treatment of feline hyperthyroidism. Although ultrasound provides accurate evaluation of the thyroid glands, it cannot replace 99mTcO-4 scintigraphy for screening of metastatic lesions and ectopic glands. 相似文献