摘要:
The invention relates to the field of engineering physics in particular to the technique for detecting X-radiation, and it may be used for photometry, dosimetry as well as for measuring of space energy characteristics of optical-and-ionizing radiation fields with the aim of body X-ray scanning, human body in particular, to identify thereon or therein some highly undesirable objects or substances both for medical and security applications i.e. to prevent thefts and acts of terrorism and to provide the security of residential and other buildings that is in airports, banks and other high-risk areas. The X-ray screening of the body is realized by means of scanning it with a pre-shaped collimated bunch of X-radiation of low intensity due to moving the body and a source of X-radiation provided relative to one another, reception of X-radiation transmitted by the body, shaping and analysis of the image in its electronic form. A collimator and a detector are independently movable along linear guides. The collimator is connected to the source via a telescoping bar such that the translation of the collimator causes the rotation of the source.
摘要:
A system (10) to monitor, detect and analyze chemical, radiation and/or biological threats is disclosed. The system includes a plurality of sensors (40, 70), wherein each sensor (40, 70) gathers data on chemical, radiation or biological agents. A central processing unit (42, 72) in communication with sensors analyzes sensor collected data. A transmission system (42, 72, 44) transmits data in the form of alerts from each central processing unit (42, 72) by secure, encrypted packets over a network (44).
摘要:
A method of specifying affected parts characterized by comprising the steps of detecting radiation emitted from a human body in a pinpointed manner by a radiation detector (1), inputting a detected radiation dose or intensity to a computer (3), and displaying radiation doses or intensities at respective portions of the body on a body distribution diagram on a monitor screen (4). The above radiation doses or intensities are measured while the radiation detector (1) is being gradually distanced from the body, and maximum distances at which the radiation detector can detect radiation rays are set as measurements, thereby obtaining data simply.
摘要:
A projectional densitometry system performs a scan of an individual's left and right femora by using the location of one femur to estimate a starting location for scanning the opposite femur. The estimated starting location of the second femur scan is based on metric data inputted by the operator or extracted from the first femur scan. Alternatively, the densitometry system performs an initial bone-locating scan of both femora, after which it performs a second, density-measuring scan based on the metric data extracted from the initial scan. A special leg positioning device is used to properly orient both femora for scanning, obviating the need to reposition the individual after scanning the first femur.
摘要:
A method of evaluating bone density around a radiolucent composite prosthesis (27) establishes an implant boundary (118, 124) by fitting a stored template to radio-opaque reference markers (31) embedded in the prosthesis. The implant boundary is used to create a measurement boundary (126) displaced from the implant boundary toward the bone (26) producing a conformal region of interest. Matched histograms (130) of bone density in a lateral and medial region of interest may be displayed to evaluate symmetrical stress defects. Alternatively, bone density may be displayed plotted along an axis (132) cutting across the medial and lateral sides. Fiducial points (100, 102, 104, 106, 108, 110) are identified from the bone and implant morphology to ensure that either display will have a repeatable reference, and hence that such displays will be directly comparable to later and earlier displays thereby aiding in the detection of bone change.
摘要:
A method of evaluating bone density around a radiolucent composite prosthesis (27) establishes an implant boundary (118, 124) by fitting a stored template to radio-opaque reference markers (31) embedded in the prosthesis. The implant boundary is used to create a measurement boundary (126) displaced from the implant boundary toward the bone (26) producing a conformal region of interest. Matched histograms (130) of bone density in a lateral and medial region of interest may be displayed to evaluate symmetrical stress defects. Alternatively, bone density may be displayed plotted along an axis (132) cutting across the medial and lateral sides. Fiducial points (100, 102, 104, 106, 108, 110) are identified from the bone and implant morphology to ensure that either display will have a repeatable reference, and hence that such displays will be directly comparable to later and earlier displays thereby aiding in the detection of bone change.
摘要:
An x-ray imaging system provides both scanning radiography and computed tomography by means of a modified C-arm geometry that provides improved angular rotation. Estimation techniques are used to produce missing projections of the complete tomographic projection set, and a limited size detector (50) reduces the amount of data required for reconstructing tomographic images of compact objects of unique composition within the patient (such as the spine (65)). The introduction of image artifacts caused by external volumes to the field of view is reduced by employing dual energy techniques to isolate the internal structure from the external volumes.