Assessment of Tibial Torsion Employing Fluoroscopy, Computed Tomography and the Cryosectioning Technique

Accurate assessment of tibial torsion, particularly the rotational deformity of a stabilized tibial fracture, demands precise anatomic landmarks at the proximal and distal measuring sites of the tibia. A fluoroscopic method has been proposed, utilizing the orientation of the femoral condyles and the medial malleolus to constitute two lines of reference. The relevance of using these structures for the assessment was studied while employing fluoroscopy, computed tomography, and the cryosectioning technique in 10 necropsy specimens of the human tibia. In all specimens the lines of reference were determined by each method and the tibial torsion was measured as the angle between the lines. The medial malleolus and the femoral condyles were found to present reliable anatomic landmarks for determination of the lines of reference in all employed techniques. The maximum difference between results obtained with different methods in a given specimen was 5.4°. The average difference between results with two techniques and two observers varied from 1.0 to 1.5°. The reproducibility of the fluoroscopic method, described by the estimated standard error of a single determination, was 1.3°.

Download Full-text

Determination of Plasminogen in Human Plasma by the Lysis Time Method

Thrombosis and Haemostasis ◽

10.1055/s-0038-1655622 ◽

1966 ◽

Vol 16 (01/02) ◽

pp. 001-017 ◽

Cited By ~ 8

Author(s):

W Berg ◽

K Korsan-Bengtsen ◽

J Ygge

Keyword(s):

Human Plasma ◽

Present Method ◽

Blood Donors ◽

Fibrinogen Concentration ◽

Plasmin Activity ◽

Time System ◽

Lysis Time ◽

High Dilutions ◽

Single Determination

SummaryA one-stage lysis time system containing fibrinogen, streptokinase, thrombin, and a known, small amount of plasminogen was used to determine plasminogen in plasma.The known amount of plasminogen was added to the system in order to keep the lysis times relatively short when a highly diluted plasma was tested. High dilutions of plasma were used to reduce the influence of the plasma inhibitors.The calculation of the plasminogen concentration was made on the basis of the correlation: “plasminogen = fibrinogen/lysis time” which was valid in the system. The method allowed determination of plasminogen in plasma with varying fibrinogen concentrations, as the fibrinogen concentration in plasma was considered in the calculation.The presence of “spontaneous” plasmin activity in the plasma did not influence the plasminogen determination. Estimated by this method, the plasminogen content in plasma from 32 blood donors aged 25-45 years was 13.1 ±2.4 casein u/ml. The error of a single determination was 0.3 casein u/ml. The plasminogen content in plasma, determined with the present method, is about 3-4 times higher than the content found when a caseinolytic method is used.

Download Full-text

Determination of the Activity of Pulmonary Tuberculosis: the Utility of High-Resolution Computed Tomography

Journal of the Korean Radiological Society ◽

10.3348/jkrs.2000.42.5.757 ◽

2000 ◽

Vol 42 (5) ◽

pp. 757

Author(s):

Myung Hee Chung ◽

Hae Giu Lee ◽

Won Jong Yu ◽

Hong Jun Chung ◽

Bo Sung Yang ◽

...

Keyword(s):

Computed Tomography ◽

High Resolution ◽

Pulmonary Tuberculosis ◽

High Resolution Computed Tomography

Download Full-text

New Method for Analysis of the Temporomandibular Joint Using Cone Beam Computed Tomography

Sensors ◽

10.3390/s21093070 ◽

2021 ◽

Vol 21 (9) ◽

pp. 3070

Author(s):

Sebastian Iwaszenko ◽

Jakub Munk ◽

Stefan Baron ◽

Adam Smoliński

Keyword(s):

Computed Tomography ◽

Temporomandibular Joint ◽

Cross Section ◽

Cone Beam Computed Tomography ◽

Cone Beam ◽

Section Plane ◽

New Approach ◽

Volume Of Interest ◽

Gap Width

Modern dentistry commonly uses a variety of imaging methods to support diagnosis and treatment. Among them, cone beam computed tomography (CBCT) is particularly useful in presenting head structures, such as the temporomandibular joint (TMJ). The determination of the morphology of the joint is an important part of the diagnosis as well as the monitoring of the treatment results. It can be accomplished by measurement of the TMJ gap width at three selected places, taken at a specific cross-section. This study presents a new approach to these measurements. First, the CBCT images are denoised using curvilinear methods, and the volume of interest is determined. Then, the orientation of the vertical cross-section plane is computed based on segmented axial sections of the TMJ head. Finally, the cross-section plane is used to determine the standardized locations, at which the width of the gap between condyle and fossa is measured. The elaborated method was tested on selected TMJ CBCT scans with satisfactory results. The proposed solution lays the basis for the development of an autonomous method of TMJ index identification.

Download Full-text

Molar Absorptivity Values for Aflatoxins and Justification for Their Use as Criteria of Purity of Analytical Standards

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/53.1.96 ◽

1970 ◽

Vol 53 (1) ◽

pp. 96-101 ◽

Cited By ~ 2

Author(s):

J V Rodricks ◽

L Stoloff ◽

W A Pons ◽

J A Robertson ◽

L A Goldblatt

Keyword(s):

Thin Layer ◽

Statistical Study ◽

Molar Absorptivity ◽

Confidence Limits ◽

Components Of Variance ◽

Significant Difference ◽

Single Determination ◽

Comparison Measurements ◽

Analytical Standards

Abstract Measurements of molar absorptivities in methanol were carried out by two laboratories on samples of anatoxins Bi and Gi prepared and purified independently in four laboratories and on samples of aflatoxins B2 and G2 prepared and purified independently in three laboratories. Molar absorptivities of pure aflatoxins Bi, B2, G1, and G2 in benzene-acetonitrile (98 + 2) were determined at two laboratories. With the exception of aflatoxin G2, no significant difference between aflatoxin samples could be demonstrated. Molar absorptivity values and absorbance ratios for each aflatoxin, based on these data, are given. Statistical 95% confidence limits were established for a single determination of molar absorptivity. A statistical study was made of the components of variance which contribute to the accuracy of the determination of molar absorptivity. A comparison of the fluorescence intensities of spots of various aflatoxin preparations, developed on silica gel-coated thin layer plates, with the amount of aflatoxin in each spotting solution as determined by absorbance measurements, demonstrated the validity of using absorbance and fluorescence comparison measurements for aflatoxin quantitation.

Download Full-text

Mercury-204 Determination by Emission Spectroscopy

Applied Spectroscopy ◽

10.1366/000370265789619962 ◽

1965 ◽

Vol 19 (3) ◽

pp. 87-89 ◽

Cited By ~ 1

Author(s):

F. M. Smith

Keyword(s):

Coefficient Of Variation ◽

Isotope Shift ◽

Emission Spectroscopy ◽

Electrodeless Discharge ◽

Discharge Lamp ◽

Isotope Concentration ◽

Single Determination ◽

Time Required

The determination of mercury-204 was made by using the isotope shift of the 3984 A mercury line excited by electrodeless discharge. Densitometric traces were made from film recordings of the 3984 A line and the areas under the component peaks were determined. Ratios of each of these areas to the sum of the areas from all the line components are plotted against the isotope concentration to produce a working curve. The coefficient of variation for this method is approximately 11 percent The time required for a single determination (after fabrication of the discharge lamp) is about two hours.

Download Full-text