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.)

Download PDF containing detailed information.

Recent Publications on Densitometry:
Densitometric and biochemical values of broiler tibias at different ages. The objective of this experiment was to determine the normal values of...	12th November, 2009	Department of Animal Morphology and Physiology.	Poult Sci. 2009 Dec;88(12):2644-8. DOI Direct Link
Update on bone densitometry. As the U.S. population ages, osteoporosis will become more prevalent and...	11th November, 2009	American Medical Writers Association, USA.	Radiol Technol. 2009 Nov-Dec;81(2):153BD-70BD.
Musculoskeletal manifestations in patients with malignant disease. To detect and describe the incidence of musculoskeletal manifestations in...	10th November, 2009	Rheumatology Department, Cairo University, Cairo, Egypt,	Clin Rheumatol. 2009 Nov 8. DOI Direct Link
Activation of Cyclic AMP Response Element-Binding Protein (CREB) in Aggressive Periodontal Disease. Objectives: To report a novel observation of neutrophil signal...	10th November, 2009		Quintessence Int. 2009 Nov-Dec;40(10):857-63.
[Severity Related Differences in Lung Attenuation in Men With COPD.] BACKGROUND AND OBJETIVES: We compare the inspiratory and expiratory...	10th November, 2009	Servicio de Radiologia, Hospital Universitario La Paz, Madrid, Espana.	Arch Bronconeumol. 2009 Nov 4. DOI Direct Link
→View more research publications.

Press Releases About Densitometry:
Access to Osteoporosis Testing for Americans in Jeopardy	3rd April, 2009	National Osteoporosis Foundation	DXA Task Force Urges Congress to Pass Bill to Protect Patient Access WASHINGTON, April 3 /PRNewswire-USNewswire/ -- In an effort to protect patient access to osteoporosis testing and reduce the
Inventor of G-Suit Dies	23rd March, 2009	Mayo Clinic	Dr. Earl Wood was Mayo pioneer in aerospace medicine ROCHESTER, Minn., March 23 /PRNewswire-USNewswire/ -- Earl Wood, M.D., Ph.D., the Mayo Clinic investigator credited with inventing the high
Desert Radiologists Welcomes Five New Physicians to the Practice	26th August, 2008	Desert Radiologists	LAS VEGAS, Aug. 26 /PRNewswire/ -- Desert Radiologists, Nevada's largest and most trusted medical imaging company today announced that five new physicians have joined the team of board
Perceptive Informatics Appoints Leading Imaging Expert Dr. Kenneth G. Faulkner to Vice President of Medical Imaging	28th July, 2008	PAREXEL International Corporation	BOSTON, July 28 /PRNewswire-FirstCall/ -- Perceptive Informatics, the technology subsidiary of PAREXEL International Corporation (Nasdaq: PRXL), a leading global biopharmaceutical services

BioNews Results for Densitometry:
CT Scan Appearance, Densitometry, and Health Status in Protease Inhibitor SZ {alpha}1-Antitrypsin Deficiency	CHEST:  Nov 5 2009 9:36PM Matching: densitometry

Densitometry Clinical Trials:
T-Score Comparability Between GE Lunar Prodigy and Norland Excel Densitometers

Densitometry Patents:
US Patent No.	Title
7595304	Polymeric oligonucleotide prodrugs
7598370	siRNA targeting polo-like kinase-1 (PLK-1)
7599803	Hydrocarbon well test method and system
7601493	Methods and apparatus for screening and detecting multiple genetic mutations
7601511	Biotin-facilitated transport in gram negative bacteria
→View more patents.

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
→View more Densitometry related companies.

BioPortfolio Ltd. offers e-mail and postal lists for Densitometry scientists - we have details of around 1595 individuals working on Densitometry .