Download - Bone Densitometry
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BONE DENSITOMETRY
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BONE DENSITOMETRYTHE ART AND SCIENCE OF MEASURING THE BONE MINERAL CONTENT AND DENSITY OF SPECIFIC SKELETAL SITES OR THE WHOLE BODY.
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THE MOST VERSATILE AND WIDELY USED TECHNIQUEDUAL X-RAY ABSORPTIOMETRY
DXA
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DXA
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DXA ADVANTAGESLOW RADIATION DOSEWIDE AVAILABILITYEASE OF USESHORT SCAN TIMEHIGH RESOLUTION IMAGESGOOD PRECISIONSTABLE CALIBRATION
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DXAIS A SUBTRACTION TECHNIQUE- SOFT TISSUE STRUCTURES ARE ELIMINATED. X-RAY ATTENUATION OF THE BONE IS MEASURED. BONE MINERAL DENSITY IS CALCULATED (BMD)
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BMD
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DXASCANS PROVIDE IMAGES FOR THE PURPOSE OF CONFIRMING THE CORRECT POSITIONING OF THE PATIENT AND CORRECT PLACEMENT OF ROI ( REGION OF INTEREST)
IMAGES ARE NOT USED FOR DIAGNOSIS!!
THE BONE DENSITY RESULTS ARE COMPUTED AND PRINTED BY SOFTWARE
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DXA COMPUTATIONAL SOFTWARE
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HISTORYOSTEOPOROSIS UNDETECTED AND OVERLOOKED UNTIL 1920s.THE FIRST PUBLICATION ABOUT BONE MASS APPEARED IN 1930s.RA- RADIOGRAPHIC ABSORPTIOMETRY- X-RAY TAKEN AND COMPARED TO A STANDARD RADIOGRAPH RADIOGAMMETRY INTRODUCED IN THE 1960s IN RESPONSE TO THE MEASUREMENT OF A BONE LOSS IN ASTRONAUTS.
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IN 1970 CT WAS USED THROUGH THE SPECALIZED SOFTWARE. QUANTITATIVE CT.1970s AND 1980s BROUGHT THE FIRST DEDICATED SCANNERS. FIRST SPA THEN DPA. USED RADIOISOTOPE AS A SOURCE OF RADIATION.FIRST COMMERCIAL DXA SCANNER INTRODUCED IN 1987 FIRST USED RADIOISOTOPE AS THE X-RAY SOURCE THEN REPLACED BY THE X-RAY TUBE.
DXA OF THE HIP AND SPINE IS THE MOST ACCEPTED METHOD FOR MEASURING BONE DENSITY
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CT BONE DENSITOMETRY
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SPA SCANNER
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HIP AND SPINE DXA
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BONE BIOLOGY
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SKELETON PURPOSESBODY SUPPORT
RED BLOOD CELLS MANUFACTURING
MINERAL STORAGE
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BONE TYPESCORTICAL
TRABECULAR- ( CANCELLOUS)
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BONE CROSS-SECTION
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CORTICAL BONE ACCOUNTS FOR 80% OF SKELETAL MASS
IT SUPPORTS WEIGHT
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TRABECULAR BONE IS THE DELICATE LATTICE WITHIN THE BONE THAT ADDS STRENGTH
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SPECIFIC BONE40% ORGANIC MATTER
60% BONE MINERALDXA MEASURES THE DENSITY OF BONE MINERAL
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BONE IS CONSTANTLY GOING HROUGH THE REMODELING PROCESS
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PEAK BONE MASS AT THE AGE OF 30-35
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DECREASING BONE MASS STARTING AT THE AGE OF 50
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DECREASE IN BONE MASS PRONOUNCED IN WOMEN AT MENOPAUSE
LOSS OF BONE PRESERVING ESTROGEN!
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OSTEOPOROSISOsteoporosis, or "thin" bones, is a disease that gradually weakens bones, making them more fragile and likely to break. It is not a form of arthritis. Osteoporosis leads to an increase in certain types of fractures (broken bones), such as hip fractures, wrist fractures, and compression fractures of the spinal vertebrae (back bones)
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RISK FACTORS FOR OSTEOPOROSIS IN WOMENMENOPAUSESMALL BONE FRAMEFAMILY HISTORYADVANCED AGELOW CALCIUM DIETINACTIVE LIFESTYLECIGARETTE SMOKINGGI MALABSORPTION PROBLEMCERTAIN MEDICATION USE- CORTICOSTEROIDS
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MINERAL CONTENT CALCULATION IN BONE DENSITOMETRYBMC = BMD X AREA
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DXA SYSTEMSPENCIL BEAM
FAN BEAM
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PENCIL BEAM SCANNER
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FAN BEAM SCANNER