Technical note: A new method for measuring long bone curvature using 3D landmarks and semi-landmarks

Abstract OBJECTIVE: We report three patients with symptomatic isolated fourth ventricle after ventriculoperitoneal shunt placement for hydrocephalus associated with ventricular hemorrhage. All three patients were treated successfully with our new method of endoscopic aqueductal stenting under navigating system guidance. METHODS: A therapeutic rigid endoscope was inserted through the thin cerebellar hemisphere, and endoscopic aqueductal stenting was performed via the enlarged fourth ventricle under navigating system guidance. RESULTS: All three patients underwent successful procedures with good outcomes. CONCLUSION: Our method of aqueductal stenting is a reasonable choice for initial treatment of patients with isolated fourth ventricle, and it entails less invasive neurosurgery.

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Technical Note: Weight approximation of coccoliths using a circular polarizer and interference colour derived retardation estimates – (The CPR Method)

Biogeosciences ◽

10.5194/bg-11-1899-2014 ◽

2014 ◽

Vol 11 (7) ◽

pp. 1899-1910 ◽

Cited By ~ 12

Author(s):

J. Bollmann

Keyword(s):

Theoretical Calculations ◽

Polarized Light ◽

Calibration Method ◽

Calibration Procedure ◽

Technical Note ◽

New Method ◽

Interference Colour ◽

Circular Polarizer ◽

Empirical Calibration ◽

First Time

Abstract. A circular polarizer is used for the first time to image coccoliths without the extinction pattern of crossed polarized light at maximum interference colour. The combination of a circular polarizer with retardation measurements based on grey values derived from theoretical calculations allows for the first time accurate calculations of the weight of single coccoliths thinner than 1.37 μm. The weight estimates of 364 Holocene coccoliths using this new method are in good agreement with published volumetric estimates. A robust calibration method based on the measurement of a calibration target of known retardation enables the comparison of data between different imaging systems. Therefore, the new method overcomes the shortcomings of the error prone empirical calibration procedure of a previously reported method based on birefringence of calcite. Furthermore, it greatly simplifies the identification of coccolithophore species on the light microscope as well as the calculation of the area and thus weight of a coccolith.

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Technical note: A new method for preparing renal tissue for microdissection

Pathology ◽

10.3109/00313028309085178 ◽

1983 ◽

Vol 15 (4) ◽

pp. 487-489

Author(s):

Ariane D’Argent ◽

R.W. Lambert ◽

J.D. Tange

Keyword(s):

Renal Tissue ◽

Technical Note ◽

New Method

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