A low cost spot densitometer system is described. This system is useful for quantitative autoradiography of local cerebral glucose utilization, blood flow, receptor binding and other applications requiring densitometry on films. The densitometer can be used alone or interfaced to a microcomputer. The densitometer consists of a photographic enlarger, a digital multimeter, and the densitometer el...

The concentrations of serum immunoglobulins (Ig) C, A, and M were correlated with specific features in the $y region of densitometer patterns of serum protein electrophoresis on cellulose acetate membranes; visual analysis of densitometer patterns permitted semiquantitative prediction of values for lgC and lgA. Important immunoglobulin abnormalities, particularly elevations of IgA, were seen in...

In discussing the principles of quantitative analysis in thin-layer media, we show that requirements for quantitative analysis are not satisfied when stained protein electrophoretic bands are scanned with a conventional rectangular-slit densitometer. We investigated a high-resolution densitometer based on a linear photodiode array as an alternative analytical tool, using stained electrophoretic...

This study compares in vivo measurements of macular pigment (MP) obtained using customized heterochromatic flicker photometry (cHFP; Macular Metrics Densitometer(™)), dual-wavelength fundus autofluorescence (Heidelberg Spectralis(®) HRA + OCT MultiColor) and single-wavelength fundus reflectance (Zeiss Visucam(®) 200). MP was measured in one eye of 62 subjects on each device. Data from 49 subjec...

The electrophoretic separation of human proteins (for example serum proteins and lipoproteins) is a very popular test in clinical chemistry; separation is usually followed by a densitometric reading. In this paper the characteristics and performance of a new automatic densitometer are described (the IL Densiscan, Instrumentation Laboratory SpA, Italy), together with the results of an evaluation...

objectives: the purpose of this study was to develop and test a new tool for radiographic densitometry by combining periapical films and aluminum step wedge. materials and methods: we reviewed 50 kodak e-speed intraoral films. an aluminum step wedge consisting of 16 steps was constructed. each step was 1mmx3mx10mm. the step wedge was exposed to varying exposure times, ranging from 0.05 second t...