Densitometry

Densitometry is the quantitative measurement of optical density in light-sensitive materials, such as photographic film, due to exposure to light. Optical density is a result of the darkness of a developed picture and can be expressed absolutely as the number of dark spots in a given area, but usually it is a relative value, expressed in a scale. Density is also the logarithm of the inverse of transparency.Since density is usually measured by the decrease in the amount of light which shines through a transparent film, it is also called absorptiometry, the measure of light absorption through the medium. The corresponding measuring device is called a densitometer or an absorptiometer.According to the principle of operation of the densitometer, one can have:* spot densitometry: the value of light absorption is measured at a single spot* line densitometry: the values of successive spots along a dimension are expressed as a graph* bidimensional densitometry: the values of light absorption are expressed as a 2D synthetic image, usually using false-color shadingDual energy X-ray absorptiometry is used in medicine to evaluate calcium bone density, which is altered in several diseases such as osteopenia and osteoporosis. Special devices have been developed and are in current use for clinical diagnosis, called bone densitometers. (From the Wikpedia article Densitometry.)

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Recent Publications on Densitometry:
Total and regional bone mineral content in healthy Spanish subjects by dual-energy X-ray absorptiometry. DESIGN: This is an observational cross-sectional study. OBJECTIVE: The aim...	3rd July, 2008	Departamento de Anatomia y Embriologia Humana, Facultad de Medicina,	Skeletal Radiol. 2008 Jul 2;. DOI Direct Link
The Alara Metriscan phalangeal densitometer: evaluation and triage thresholds. The Metriscan (Alara Inc, CA) is a compact digital radiographic...	2nd July, 2008	Centre for Metabolic Bone Disease, Hull And East Yorkshire Hospitals NHS	Br J Radiol. 2008 Jun 30;. DOI Direct Link
Advanced CT bone imaging in osteoporosis. Non-invasive and/or non-destructive techniques can provide structural...	2nd July, 2008	University of California,	Rheumatology (Oxford). 2008 Jul;47 Suppl 4:iv9-16. DOI Direct Link
Characterization of Rhamnolipid Produced by Pseudomonas aeruginosa Isolate Bs20. Rhamnolipid produced by Pseudomonas aeruginosa isolate Bs20 is viscous...	28th June, 2008	Department of Microbiology and Immunology, Faculty of Pharmacy, Ain Shams	Appl Biochem Biotechnol. 2008 Jun 27;. DOI Direct Link
Discrepancies between qualitative and quantitative analysis of cerebrospinal fluid IgG: densitometric comparison of nephelometry-silver versus immuno-enzymes. BACKGROUND: Detection of local synthesis of IgG within the central nervous...	28th June, 2008	Department of Neuroinflammation, Institute of Neurology, Queen Square,	Ann Clin Biochem. 2008 Jul;45(Pt 4):404-8. DOI Direct Link
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BioNews Results for Densitometry:
17th Scientific Meeting of the International Bone and Mineral Society	Checkbiotech:  Jul 3 2008 4:04AM Matching: densitometry

Densitometry Clinical Trials:
T-Score Comparability Between GE Lunar Prodigy and Norland Excel Densitometers	Bone Densitometry
Effects of a Uridine Supplement on HIV Infected Adults With Lipoatrophy	HIV Infections;   Lipoatrophy
Bone Density and Serum Testosterone in Male Methadone Maintained Patients	Opiate Dependence;   Osteoporosis;   Erectile Dysfunction;   Hypogonadism
TESRA: (Treatment of Emphysema With a Gamma-Selective Retinoid Agonist)	Emphysema Interventions: Drug: RAR Gamma;   Drug: Placebo
Can Parathyroid Hormone Injections Reverse Glucocorticoid-Induced Osteoporosis	Osteoporosis Intervention: Drug: Parathyroid hormone (hPTH 1-34)
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Densitometry Patents:
US Patent No.	Title
7371521	Methods
7375133	Pharmaceutical compositions including carotenoid ether analogs or derivatives for the inhibition and amelioration of disease
7378087	Method of enhancing an immune response
7378246	Methods and compositions for regulating adipogenesis
7378257	Bacterial superantigen vaccines
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Companies working in the area of Densitometry from Bioportfolio's Biocorporate database :
Company Name
Advanced American Biotechnology Advanced American Biotechnology & Imaging providing software and hardware for electrophoresis, TLC, image analysis, gel documentation and densitometry... www.aabi.com/        View full profile
Wendt-Bristol Health Service An outpatient health care provider. The Company's operations consist of ownership and operation of a nursing home, acting as managing partner of two multi-disciplinary diagnostic/radiology centers...         View full profile
LOH KEH CHUAN Diabetes, Thyroid & Hormone Clinic Diabetesincludes on-site HbA1c and urine microalbumin testing, diabetes education, treatment of diabetes in pregnancy and diabetes-related complications Thyroid disordersincludes bedside thyroid... www.endocrinology.com.sg/        View full profile
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BioPortfolio Ltd. offers e-mail and postal lists for Densitometry scientists - we have details of around 1595 individuals working on Densitometry .

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