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THE LONG-TERM OBJECTIVE OF THIS PROGRAM IS THE DEVELOPMENT OF THE CAPABILITY OF PRECISION PROTON RADIOGRAPHY WITH ACCELERATOR SYSTEMS DESIGNED OR USED FOR PROTON RADIATION THERAPY. A PROTON RADIOGRAPH TAKEN IMMEDIATELY PRIOR TO RADIATION TREATMENT COULD GIVE INCREASED CONFIDENCE IN THE ADEQUACY OF THE TREATMENT PLAN, CHECK ALIGNMENT WITH TUMOR SITE, AND CONFIRM READINESS AND CALIBRATION OF THE ENT ...

IN TREATING GLAUCOMA, THE CLINICIAN ATTEMPTS TO LOWER THE INTRAOCULAR PRESSURE (IOP) BUT, BECAUSE IT IS NOT CONSTANT, A SINGLE MEASUREMENT DURING A VISIT TO THE OPHTHALMOLOGIST MAY BE UNRELIABLE. THE MEASUREMENT OF THE IOP AT THE PATIENT'S HOME HAS BEEN ADVOCATED BUT HAS BEEN HAMPERED BY THE LACK OF AN INSTRUMENT THAT CAN BE USED RELIABLY AND SAFELY BY THE PATIENT ALONE. A SELF-TONOMETER, RECENTLY ...

WE SEEK TO DEVELOP A VIABLE, COST-EFFECTIVE, SAFE STROKE REHABILITATION DEVICE BASED UPON THE ELECTRONIC STIMULATION OF STROKE-AFFECTED LIMBS. A KEY PROBLEM IN STROKE REHABILITATION THERAPY IS TO HAVE THE STROKE IMPAIRED LIMBS EXERCISED ENOUGH TO AVOID MUSCLE ATROPHY OR DEFORMATION FROM CONTRACTURES. IN GENERAL, PHYSICAL THERAPISTS DO NOT HAVE SUFFICIENT TIME TO WORK WITH THE PATIENT TO PROVIDE TH ...

DISCRETE ELEMENT X-RAY DETECTORS DEVELOPED FROM MEDICAL COMPUTED TOMOGRAPHY (CT) ARE BEING APPLIED TO INDUSTRIAL X-RAY DIGITAL RADIOGRAPHY (DR) AND CT IMAGING. A DR TECHNIQUE KNOWN AS SLIT RADIOGRAPHY, USING THESE DETECTORS, MAY HAVE SPECIAL APPLICATION FOR BOND LINE DEFECTS IN CYLINDRICAL ASSEMBLIES. SLIT RADIOGRAPHY CAN QUICKLY MAP DENSITY VARIATIONS WITHIN THE ROCKET MOTOR WALL ASSOCIATED WITH ...

THE RESEARCHERS PROPOSE TO EXTEND THEIR PREVIOUS WORK IN HIGH-ENERGY X-RAY BACKSCATTER IMAGING TOMOGRAPHY (BIT) TO HIGHER ENERGY RANGES IN ORDER TO ACHIEVE GREATER PENETRATIONDEPTHS. AT ENERGIES GREATER THAN A FEW MEV, THE PREDOMINANTINTERACTION IS NO LONGER COMPTON SCATTERING, BUT PAIR PRODUCTION. SINCE THE RESULTING POSITRONS DO NOT ANNIHILATE(CREATING DETECTABLE 511 KEV RADIATION) AT THE ORIGIN ...

THE LONG-TERM STORAGE OF LOW LEVEL NUCLEAR WASTE IN CEMENT SOLIDIFIED DRUMS HAS GIVEN RISE TO A NEED FOR A NONDESTRUCTIVE EXAMINATION (NDE) TECHNIQUE THAT WILL DETERMINE THE PRESENCE OF FREE LIQUIDS. WE PROPOSE TO DEVELOP, EVALUATE, AND IMPLEMENT A NEW RADIOGRAPHIC NDE TECHNIQUE WITH EXCELLENT LOW CONTRAST AND DEPTH RESOLUTION FOR THIS PURPOSE. RECENT ADVANCES IN PROJECTION RADIOGRAPHYHAVE EXTENDE ...

THE PRIMARY EFFORT OF THIS PROGRAM DEVELOPS AN INSTRUMENT THAT WILL ALLOW INTERNAL IMAGING OF ROCKET MOTORS AND NOZZLES DURING LIVE STATIC FIRES. THIS INSTRUMENT WILL PRODUCE VOXEL-BY-VOXEL X-RAY DATA SO THAT A THREE-DIMENSIONAL IMAGE OF THE ROCKET CAN BE MADE IN REAL-TIME DURING FIRING. THE PRINCIPLE OF OPERATION, FLASH LAMINOGRAPHY, COMBINES TWO IDEAS: (1) SIMULTANEOUSLY-STROBED X-RAY SOURCES TO ...

WE PROPOSE TO DEVELOP AND VERIFY IN THIS PHASE I PROGRAM A TECHNIQUE THAT WILL ACCURATELY AND REPEATABLY MEASURE SURFACE PROFILES AND DISTANCES BETWEEN A TEST OBJECT AND DETECTORS USING THE SHEARING HETERODYNE INTERFEROMETRY TECHNIQUE. THE TECHNIQUE IS BASED ON SHEARING HETERODYNE INTERFEROMETRY WITH A FREQUENCY MODULATED LASER DIODE USING THE FOUR-BUCKET-INTEGRATING TECHNIQUE. IT CAN BE USED TO D ...

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AN ANODIC ALUMINUM OXIDE COATING HAS BEEN RECOMMENDED FOR THE SPACE STATION CREW SYSTEMS RADIATOR. CRACKING BY THERMAL FATIGUE IS ITS PROBABLE LONG-TERM FAILURE MECHANISM, BUT IT IS NOT CLEAR HOW TO PERFORM ACCELERATED THERMAL CYCLE TESTS TO GET A RELIABLE PREDICTION OF LIFETIME. WE PROPOSE TO MEASURE THE STRESS, AND TEMPERATURE DEPENDENCE OF STRESS OF ANODIC COATINGS. A THERMAL STRAIN PARAMETER I ...