Evaluation of Parotid Gland Function using Equivalent - J
... the use of radionuclides obviously means that radiation exposure for human bodies is unavoidable,4) making this technique unsuitable for regular evaluation of parotid gland depression caused by radiotherapy. Magnetic resonance imaging (MRI) uses magnetism and electromagnetic waves, representing a no ...
... the use of radionuclides obviously means that radiation exposure for human bodies is unavoidable,4) making this technique unsuitable for regular evaluation of parotid gland depression caused by radiotherapy. Magnetic resonance imaging (MRI) uses magnetism and electromagnetic waves, representing a no ...
Direct visualization and quantification of bone growth into porous
... specimen and the inability to efficiently provide detailed information regarding a variety of three dimensional (3D) spatial parameters such as the effect of connectivity on bone ingrowth [10]. High resolution, 3D imaging techniques such as micro computed tomography (lCT) have been advantageous for ...
... specimen and the inability to efficiently provide detailed information regarding a variety of three dimensional (3D) spatial parameters such as the effect of connectivity on bone ingrowth [10]. High resolution, 3D imaging techniques such as micro computed tomography (lCT) have been advantageous for ...
Guidelines for Performing Ultrasound Guided Vascular Cannulation
... 3. ULTRASOUND-GUIDED VASCULAR CANNULATION ...
... 3. ULTRASOUND-GUIDED VASCULAR CANNULATION ...
Guidelines for Performing Ultrasound Guided Vascular Cannulation
... 3. ULTRASOUND-GUIDED VASCULAR CANNULATION ...
... 3. ULTRASOUND-GUIDED VASCULAR CANNULATION ...
slice
... & Detector Converts x-rays to light & Light converted to electronic signal & Electronic signal constructed to make image in a computer & Density differentiation – grayscale / colour images Always Thinking Ahead. ...
... & Detector Converts x-rays to light & Light converted to electronic signal & Electronic signal constructed to make image in a computer & Density differentiation – grayscale / colour images Always Thinking Ahead. ...
The concept and challenges of TomoTherapy accelerators
... In the 1970s, the invention and subsequent medical use of the x-ray computed tomography (CT) led to 2D radiotherapy, and 20 years later, advances in computer technology made 3D conformal radiotherapy possible. Currently, image-guided radiation therapy (IGRT) refers to many techniques, which apply va ...
... In the 1970s, the invention and subsequent medical use of the x-ray computed tomography (CT) led to 2D radiotherapy, and 20 years later, advances in computer technology made 3D conformal radiotherapy possible. Currently, image-guided radiation therapy (IGRT) refers to many techniques, which apply va ...
Classification of hypervascular liver lesions based on hepatic artery
... metastases on average both had increased hepatic artery coefficients compared to the background liver. Compared to HCC, benign lesions on average had either a greater hepatic artery coefficient (hemangioma), or greater portal vein coefficient (focal nodular hyperplasia, or transient hepatic atte ...
... metastases on average both had increased hepatic artery coefficients compared to the background liver. Compared to HCC, benign lesions on average had either a greater hepatic artery coefficient (hemangioma), or greater portal vein coefficient (focal nodular hyperplasia, or transient hepatic atte ...
Role of Imaging in the Management of Trauma Victims
... be more sensitive and specific than NEXUS, and their use would have resulted in lower radiography rates (Stiell et al. 2003). When a cervical spine fracture cannot be ruled out by the above-mentioned criteria, imaging must be performed. The sensitivity of the three-view radiographs in identifying a c ...
... be more sensitive and specific than NEXUS, and their use would have resulted in lower radiography rates (Stiell et al. 2003). When a cervical spine fracture cannot be ruled out by the above-mentioned criteria, imaging must be performed. The sensitivity of the three-view radiographs in identifying a c ...
pet/ct atlas on quality control and image artefacts
... The IAEA has no responsibility for the persistence or accuracy of URLs for external or third party Internet web sites referred to in this book and does not guarantee that any content on such web sites is, or will remain, accurate or appropriate. ...
... The IAEA has no responsibility for the persistence or accuracy of URLs for external or third party Internet web sites referred to in this book and does not guarantee that any content on such web sites is, or will remain, accurate or appropriate. ...
006 RSNA News Jun04.qxd
... interpret films. “Partially interpret” means that their task was to separate the normal films from the abnormal so that the workload of the radiologist could be reduced and his or her attention focused on the abnormal cases. I had the privilege of working with two of these ARTs in an HMO in New ...
... interpret films. “Partially interpret” means that their task was to separate the normal films from the abnormal so that the workload of the radiologist could be reduced and his or her attention focused on the abnormal cases. I had the privilege of working with two of these ARTs in an HMO in New ...
Multilayer Energy Discriminating Detector for Medical X
... Contrast-enhanced mammography (CEM) relies on visualizing the growth of new blood vessels (i.e. tumor angiogenesis) to provide sufficient materials for cell proliferation during the development of cancer. Since cancers will accumulate an injected contrast agent more than other tissues, it is possibl ...
... Contrast-enhanced mammography (CEM) relies on visualizing the growth of new blood vessels (i.e. tumor angiogenesis) to provide sufficient materials for cell proliferation during the development of cancer. Since cancers will accumulate an injected contrast agent more than other tissues, it is possibl ...
Retinal assessment using optical coherence tomography
... sectioning of neighboring retinal regions to generate a retinal thickness map (Zeimer et al., 1996), information is restricted to fundus (macular) regions of 2 " 2 mm and limited qualitative data can be extracted from such imaging methodology. Optical coherence tomography (OCT) is based on the imagi ...
... sectioning of neighboring retinal regions to generate a retinal thickness map (Zeimer et al., 1996), information is restricted to fundus (macular) regions of 2 " 2 mm and limited qualitative data can be extracted from such imaging methodology. Optical coherence tomography (OCT) is based on the imagi ...
- AMS Tesi di Dottorato
... rotates around the body and an x-ray beam passes through the animal from various directions. The x-ray attenuation along the animal’s body is calculated with a mathematical algorithm and images are finally converted into shades of grayscale. Till today five generations of computed tomography scanner ...
... rotates around the body and an x-ray beam passes through the animal from various directions. The x-ray attenuation along the animal’s body is calculated with a mathematical algorithm and images are finally converted into shades of grayscale. Till today five generations of computed tomography scanner ...
Abstracts - dicom (nema)
... which defines a specimen data model to accommodate a wide variety of relevant information needed to interpret pathology images, such as type of specimen, procedure used to obtain specimen, physical and chemical processing, sampling and sub-sampling methods, etc. An important part of the Supplement i ...
... which defines a specimen data model to accommodate a wide variety of relevant information needed to interpret pathology images, such as type of specimen, procedure used to obtain specimen, physical and chemical processing, sampling and sub-sampling methods, etc. An important part of the Supplement i ...
European Commission. European guidelines on radiation protection
... X-rays are a type of electromagnetic (EM) radiation. EM radiation also includes visible light, radio waves, microwaves, cosmic radiation, and several other varieties of ‘rays’. All can be considered as ‘packets’ of energy, called photons, which have wave properties, most importantly a wavelength and ...
... X-rays are a type of electromagnetic (EM) radiation. EM radiation also includes visible light, radio waves, microwaves, cosmic radiation, and several other varieties of ‘rays’. All can be considered as ‘packets’ of energy, called photons, which have wave properties, most importantly a wavelength and ...
International Workshop on Monte Carlo Techniques in Medical
... Monte Carlo simulations (MCS) applied in particle physics play a key role in medical imaging and particle therapy. In such simulations particles are transported through voxelized phantoms derived from patient CT images. However, a voxelised phantom representation has limitations in certain medical a ...
... Monte Carlo simulations (MCS) applied in particle physics play a key role in medical imaging and particle therapy. In such simulations particles are transported through voxelized phantoms derived from patient CT images. However, a voxelised phantom representation has limitations in certain medical a ...
THE COMPARISON OF MULTISLICE COMPUTED TOMOGRAPHY
... wall could be obtained by administering it at a rate of 5ml/sec for 64 slice CT (12). As the number of detectors increased, the required contrast material decreased. In the exams performed with 64 slice equipment, 80 ml of contrast would be sufficient while 100 ml contrast would be required for 16 s ...
... wall could be obtained by administering it at a rate of 5ml/sec for 64 slice CT (12). As the number of detectors increased, the required contrast material decreased. In the exams performed with 64 slice equipment, 80 ml of contrast would be sufficient while 100 ml contrast would be required for 16 s ...
Computed Tomography Radiation Safety Issues in Ontario
... The use of CT for medical diagnosis has substantially increased over the past decade, resulting in increasing patient radiation dose from this imaging modality.(2, 4, 14, 19) The introduction of 64-slice CT scanners has further increased the patient throughput and the indications for CT. There is a ...
... The use of CT for medical diagnosis has substantially increased over the past decade, resulting in increasing patient radiation dose from this imaging modality.(2, 4, 14, 19) The introduction of 64-slice CT scanners has further increased the patient throughput and the indications for CT. There is a ...
Tumor Dosimetry in a Phase I Study of Lu(177)-DOTA
... in more effective, systematic treatment with fewer negative side effects. New technology makes it possible to trace the radioactivity through the body, further tailoring the treatment to individual patients. Radioactive elements have a long and intertwined history with the medical field. Irene Curie ...
... in more effective, systematic treatment with fewer negative side effects. New technology makes it possible to trace the radioactivity through the body, further tailoring the treatment to individual patients. Radioactive elements have a long and intertwined history with the medical field. Irene Curie ...
AAPM/RSNA Physics Tutorial for Residents: Topics in CT
... specifically developed to describe the radiation dose from computed tomography (CT). Basic concepts of radiation dose are reviewed, including exposure, absorbed dose, and effective dose. Radiation dose from CT demonstrates variations within the scan plane and along the z axis because of its unique g ...
... specifically developed to describe the radiation dose from computed tomography (CT). Basic concepts of radiation dose are reviewed, including exposure, absorbed dose, and effective dose. Radiation dose from CT demonstrates variations within the scan plane and along the z axis because of its unique g ...
Clinical Applications of ASL methods
... With the us of arterial spin labeling in clinical studies, for instance in patients with a stenosis/occlusion or acute stroke, one should realize that a local increase in transit time may result in an underestimation of the CBF. Furthermore, when there is intravascular label, arterial spin labeling ...
... With the us of arterial spin labeling in clinical studies, for instance in patients with a stenosis/occlusion or acute stroke, one should realize that a local increase in transit time may result in an underestimation of the CBF. Furthermore, when there is intravascular label, arterial spin labeling ...
An experimental approach to Automatic Exposure Control testing
... Chapter 2 begins with a developmental timeline of x-ray devices and x-ray exposure control. It includes the development of x-ray production and the early understandings of image quality relating to x-ray tube design. Radiation safety issues soon became apparent to the early pioneers of x-ray, with t ...
... Chapter 2 begins with a developmental timeline of x-ray devices and x-ray exposure control. It includes the development of x-ray production and the early understandings of image quality relating to x-ray tube design. Radiation safety issues soon became apparent to the early pioneers of x-ray, with t ...
MAMMOGRAPHIC ACCREDITATION PHANTOM
... mammography units, because the field of view on the digital system is typically much smaller than the 24 x 30 cm field of view on conventional mammography units. In order to image the Mammographic Accreditation Phantom (specified by the ACR) on the biopsy units, the user has to move the phantom to v ...
... mammography units, because the field of view on the digital system is typically much smaller than the 24 x 30 cm field of view on conventional mammography units. In order to image the Mammographic Accreditation Phantom (specified by the ACR) on the biopsy units, the user has to move the phantom to v ...
The Evolution of Multiple Sclerosis Lesions on Serial MR
... AJNR 16:1481–1491, Aug 1995 0195-6108/95/1607–1481 ...
... AJNR 16:1481–1491, Aug 1995 0195-6108/95/1607–1481 ...
EANM-EORTC general recommendations for sentinel node
... SN to proceed directly to CLND (cf. Sect. 6: Image acquisition and interpretation) ...
... SN to proceed directly to CLND (cf. Sect. 6: Image acquisition and interpretation) ...
Medical imaging
Medical imaging is the technique and process of creating visual representations of the interior of a body for clinical analysis and medical intervention. Medical imaging seeks to reveal internal structures hidden by the skin and bones, as well as to diagnose and treat disease. Medical imaging also establishes a database of normal anatomy and physiology to make it possible to identify abnormalities. Although imaging of removed organs and tissues can be performed for medical reasons, such procedures are usually considered part of pathology instead of medical imaging.As a discipline and in its widest sense, it is part of biological imaging and incorporates radiology which uses the imaging technologies of X-ray radiography, magnetic resonance imaging, medical ultrasonography or ultrasound, endoscopy, elastography, tactile imaging, thermography, medical photography and nuclear medicine functional imaging techniques as positron emission tomography.Measurement and recording techniques which are not primarily designed to produce images, such as electroencephalography (EEG), magnetoencephalography (MEG), electrocardiography (ECG), and others represent other technologies which produce data susceptible to representation as a parameter graph vs. time or maps which contain information about the measurement locations. In a limited comparison these technologies can be considered as forms of medical imaging in another discipline.Up until 2010, 5 billion medical imaging studies had been conducted worldwide. Radiation exposure from medical imaging in 2006 made up about 50% of total ionizing radiation exposure in the United States.In the clinical context, ""invisible light"" medical imaging is generally equated to radiology or ""clinical imaging"" and the medical practitioner responsible for interpreting (and sometimes acquiring) the images is a radiologist. ""Visible light"" medical imaging involves digital video or still pictures that can be seen without special equipment. Dermatology and wound care are two modalities that use visible light imagery. Diagnostic radiography designates the technical aspects of medical imaging and in particular the acquisition of medical images. The radiographer or radiologic technologist is usually responsible for acquiring medical images of diagnostic quality, although some radiological interventions are performed by radiologists.As a field of scientific investigation, medical imaging constitutes a sub-discipline of biomedical engineering, medical physics or medicine depending on the context: Research and development in the area of instrumentation, image acquisition (e.g. radiography), modeling and quantification are usually the preserve of biomedical engineering, medical physics, and computer science; Research into the application and interpretation of medical images is usually the preserve of radiology and the medical sub-discipline relevant to medical condition or area of medical science (neuroscience, cardiology, psychiatry, psychology, etc.) under investigation. Many of the techniques developed for medical imaging also have scientific and industrial applications.Medical imaging is often perceived to designate the set of techniques that noninvasively produce images of the internal aspect of the body. In this restricted sense, medical imaging can be seen as the solution of mathematical inverse problems. This means that cause (the properties of living tissue) is inferred from effect (the observed signal). In the case of medical ultrasonography, the probe consists of ultrasonic pressure waves and echoes that go inside the tissue to show the internal structure. In the case of projectional radiography, the probe uses X-ray radiation, which is absorbed at different rates by different tissue types such as bone, muscle and fat.The term noninvasive is used to denote a procedure where no instrument is introduced into a patient's body which is the case for most imaging techniques used.