Experimental measurement of x-ray scatter
... or calculate the scatter component from raw CT data which can be divided into two major groups, namely empirical and model-based techniques. Empirical techniques include ‘blockerbased’ (Kanamori et al 1985, Endo et al 2001, Malusek et al 2003, 2008, Ay and Zaidi 2005, Zaidi and Ay 2007) and ‘collima ...
... or calculate the scatter component from raw CT data which can be divided into two major groups, namely empirical and model-based techniques. Empirical techniques include ‘blockerbased’ (Kanamori et al 1985, Endo et al 2001, Malusek et al 2003, 2008, Ay and Zaidi 2005, Zaidi and Ay 2007) and ‘collima ...
Robust Free-Breathing Whole-Heart Cine MRI using Multi
... Cardiac cine MRI has become a routine exam for assessment of cardiac function and anatomy. Conventional 2D cine requires separate scouting scans to localize different views and at each orientation multiple breathholds are required with patient recuperation time in-between breathholds. 2D cine scans ...
... Cardiac cine MRI has become a routine exam for assessment of cardiac function and anatomy. Conventional 2D cine requires separate scouting scans to localize different views and at each orientation multiple breathholds are required with patient recuperation time in-between breathholds. 2D cine scans ...
Toward simultaneous PET/MR breast imaging: Systematic
... attenuation due to hardware components needs to be compensated through appropriate attenuation correction (AC) methods that are used during the PET data reconstruction process. While hardware AC is straightforward and well established in PET/computed tomography (PET/CT) hybrid imaging,10 this concep ...
... attenuation due to hardware components needs to be compensated through appropriate attenuation correction (AC) methods that are used during the PET data reconstruction process. While hardware AC is straightforward and well established in PET/computed tomography (PET/CT) hybrid imaging,10 this concep ...
Positron Emission Tomography in the Routine Management of
... factors16 may be familial as an independent risk factor17 and predicts future coronary events18–21 or clinically manifest disease up to 10 years later.21 The three principle methods for assessing coronary endothelial function reflect different aspects of its complex multifaceted behavior with specif ...
... factors16 may be familial as an independent risk factor17 and predicts future coronary events18–21 or clinically manifest disease up to 10 years later.21 The three principle methods for assessing coronary endothelial function reflect different aspects of its complex multifaceted behavior with specif ...
Acute Sigmoid Diverticulitis and its Complications
... •Axial CT with contrast •Pericolonic rim-enhancing gas and fluid collection consistent with a diverticular abscess ...
... •Axial CT with contrast •Pericolonic rim-enhancing gas and fluid collection consistent with a diverticular abscess ...
5e770ee104f6b2f
... osteophyte is composed of dense cortical bone and articular eminence (E) is eburnated. ...
... osteophyte is composed of dense cortical bone and articular eminence (E) is eburnated. ...
The Synthesis and Evaluation of Peptide
... Figure 1.2 Components of a molecular imaging probe containing the targeting entity, the linker and a label .................................................................................................................. 2 Figure 1.3 [18F]Galacto-RGD, a PET imaging agent for oncologic applications ...
... Figure 1.2 Components of a molecular imaging probe containing the targeting entity, the linker and a label .................................................................................................................. 2 Figure 1.3 [18F]Galacto-RGD, a PET imaging agent for oncologic applications ...
Breast Cancer Screening - American Academy of Family Physicians
... SE, Holland R, et al. Image-detected breast cancer: state of the art diagnosis and treatment. J Am Coll Surg 2005;201:587. ...
... SE, Holland R, et al. Image-detected breast cancer: state of the art diagnosis and treatment. J Am Coll Surg 2005;201:587. ...
Advances in PET Imaging - Continuing Pharmacy Education
... (PET) has been available for more than 20 years, it was not widely used until about 5 years ago. Instead of being an elite tool of a handful of academic institutions, it is now available throughout the country even in rural communities. PET images are distinctly noisier and inferior in spatial resol ...
... (PET) has been available for more than 20 years, it was not widely used until about 5 years ago. Instead of being an elite tool of a handful of academic institutions, it is now available throughout the country even in rural communities. PET images are distinctly noisier and inferior in spatial resol ...
ABDOMINAL EXAMINATION IN KNH USING 16 MULTI-SLICE
... economic factors having been taken into consideration. This is in cognizance of the deleterious biological effect of radiation to the human body because no radiation can be considered safe. From a single X-ray source and single detector in the first generation, CT systems have been developed to maxi ...
... economic factors having been taken into consideration. This is in cognizance of the deleterious biological effect of radiation to the human body because no radiation can be considered safe. From a single X-ray source and single detector in the first generation, CT systems have been developed to maxi ...
Ultra-Fast Digital Tomosynthesis Reconstruction Using General
... prior to treatment, including anatomic information for setup (20-24), and CT numbers for dose calculation (25-29) and on-line/off-line re-optimization of plans (5-16). All in all, there is minimal doubt that CBCT has prominent role in current and future radiotherapy practices. In certain clinical se ...
... prior to treatment, including anatomic information for setup (20-24), and CT numbers for dose calculation (25-29) and on-line/off-line re-optimization of plans (5-16). All in all, there is minimal doubt that CBCT has prominent role in current and future radiotherapy practices. In certain clinical se ...
PET-/SPECT-MRI Attenuation Correction using
... Besides the functional information, anatomically appropriate information is frequently obtained in bone, lung, kidney, thyroid and heart studies, while in brain studies and studies for tumor detection the anatomic information may be insufficient [6]. Fusion of functional and anatomical information o ...
... Besides the functional information, anatomically appropriate information is frequently obtained in bone, lung, kidney, thyroid and heart studies, while in brain studies and studies for tumor detection the anatomic information may be insufficient [6]. Fusion of functional and anatomical information o ...
Tomotherapy vs IMRT (952kB PPT)
... better choice for its simplicity of dose delivery as well as its higher skin dose and sharper dose fall-off beyond the target. - For the ability to deliver a wide range of treatments ranging from palliation to the most complex IMRT plans, linacs will continue to provide the most efficient and flexib ...
... better choice for its simplicity of dose delivery as well as its higher skin dose and sharper dose fall-off beyond the target. - For the ability to deliver a wide range of treatments ranging from palliation to the most complex IMRT plans, linacs will continue to provide the most efficient and flexib ...
09. Quality Assurance in Paediatric Radiological - RPOP
... department, so that the findings are noted and acted on • QA program directed at equipment and operator performance can be of great value in: • improving the diagnostic information content • reducing radiation exposure ...
... department, so that the findings are noted and acted on • QA program directed at equipment and operator performance can be of great value in: • improving the diagnostic information content • reducing radiation exposure ...
Cone beam computed tomography and other imaging techniques in
... Tuned aperture computed tomography (TACT) TACT represents yet another form of radiographic imaging and is essentially a three-dimensional imageforming algorithm that can be used with any type of digital imaging system (46). It produces 3D data from several regular radiographs of a given area. Unlike ...
... Tuned aperture computed tomography (TACT) TACT represents yet another form of radiographic imaging and is essentially a three-dimensional imageforming algorithm that can be used with any type of digital imaging system (46). It produces 3D data from several regular radiographs of a given area. Unlike ...
IOSR Journal of Dental and Medical Sciences (IOSR-JDMS)
... Abstract: Accurately determining pre-therapeutic staging is an important factor in the treatment planning and prognosis in squamous cell carcinoma of tongue. While clinical examination allows direct visualization, it cannot evaluate deeper extension of disease. Cross-sectional imaging has become the ...
... Abstract: Accurately determining pre-therapeutic staging is an important factor in the treatment planning and prognosis in squamous cell carcinoma of tongue. While clinical examination allows direct visualization, it cannot evaluate deeper extension of disease. Cross-sectional imaging has become the ...
j32-2003-ieeetmi-gradient
... which require an additional surgical procedure, or on points obtained by direct contact from the anatomy surface, which require additional exposure of the anatomy and can be time-consuming and error-prone. The alternative is to use the imaged bone shapes, which are rigid, to perform the registration ...
... which require an additional surgical procedure, or on points obtained by direct contact from the anatomy surface, which require additional exposure of the anatomy and can be time-consuming and error-prone. The alternative is to use the imaged bone shapes, which are rigid, to perform the registration ...
A Monte Carlo dose simulation of chest and hip joint tomosynthesis
... disease and diffuse interstitial disease, placement of tubes and lines, and structures of the mediastinum or spine (2). Diagnostic prognosis is often made difficult due to overlying anatomy. In clinical situations today this problem can be solved using computer tomography (CT) or tomosynthesis. Tomo ...
... disease and diffuse interstitial disease, placement of tubes and lines, and structures of the mediastinum or spine (2). Diagnostic prognosis is often made difficult due to overlying anatomy. In clinical situations today this problem can be solved using computer tomography (CT) or tomosynthesis. Tomo ...
ESCH1317_Sarabjeet Singh
... and practices compared to the rest, d) support dose optimization or reduction through educated decision making about its implications, e) help avoid inadvertent miscues or misuse of scan parameters resulting in higher than need doses. ...
... and practices compared to the rest, d) support dose optimization or reduction through educated decision making about its implications, e) help avoid inadvertent miscues or misuse of scan parameters resulting in higher than need doses. ...
PACS Specification - UK Imaging Informatics Group
... where there has been CT data explosion. Storing of very thin axial slices has become the norm and will continue. a. PACS must have an automatic & seamless loading of MPR when thin CT slices are loaded (stand-alone modality workstations waste radiologists time & are inefficient) – automatic loading o ...
... where there has been CT data explosion. Storing of very thin axial slices has become the norm and will continue. a. PACS must have an automatic & seamless loading of MPR when thin CT slices are loaded (stand-alone modality workstations waste radiologists time & are inefficient) – automatic loading o ...
Evaluation of Linear Accelerator Gating with Real
... positions. The Task Group 75 guidelines state that the entrance dose per image can be as great as 0.2 cGy (18). For a 2-h session with imaging performed every 30 s, the patient would receive 48 cGy during the treatment course. Alternative image-based solutions have been investigated that use the on- ...
... positions. The Task Group 75 guidelines state that the entrance dose per image can be as great as 0.2 cGy (18). For a 2-h session with imaging performed every 30 s, the patient would receive 48 cGy during the treatment course. Alternative image-based solutions have been investigated that use the on- ...
CASE REPORT Lymphatic blockage and severe edema in
... The presence of sentinel diagnostic features such as proximal muscle weakness, skin rash, increased serum muscle enzymes, typical muscle biopsy and EMG findings were consistent with dermatomyositis. Furthermore, the severe edema was attributed to the markedly delayed lymphatic drainage, as identifie ...
... The presence of sentinel diagnostic features such as proximal muscle weakness, skin rash, increased serum muscle enzymes, typical muscle biopsy and EMG findings were consistent with dermatomyositis. Furthermore, the severe edema was attributed to the markedly delayed lymphatic drainage, as identifie ...
Digital Mammography
... the patient. In a SFM system, the automatic exposure control (AEC) will end the film exposure when the tissue above the AEC has transmitted a suitable number of x-rays to expose the film where its gradient (slope of the H&D curve) will be near or at its maximum value and there will be acceptable ima ...
... the patient. In a SFM system, the automatic exposure control (AEC) will end the film exposure when the tissue above the AEC has transmitted a suitable number of x-rays to expose the film where its gradient (slope of the H&D curve) will be near or at its maximum value and there will be acceptable ima ...
Glenoid Version Measurement when the Medial Scapula Is Not in
... superior to inferior glenoid8. Clinical utilization has chosen the mid glenoid for measuring. This is the position we selected to test and validate. As all tested scapulae were “normal”, this technique was not demonstrated for use in dysplastic or deformed scapulae. CT was more accessible for our re ...
... superior to inferior glenoid8. Clinical utilization has chosen the mid glenoid for measuring. This is the position we selected to test and validate. As all tested scapulae were “normal”, this technique was not demonstrated for use in dysplastic or deformed scapulae. CT was more accessible for our re ...
投影片 1 - 口腔病理科教學網
... Excellent for differentiating between solid & cystic masses Different echo signals are obtained from different tumors Identification of radiolucent stones Lithotripsy of salivary stones now possible Disadvantages The sound waves used are blocked by bone, so limiting the areas available for investiga ...
... Excellent for differentiating between solid & cystic masses Different echo signals are obtained from different tumors Identification of radiolucent stones Lithotripsy of salivary stones now possible Disadvantages The sound waves used are blocked by bone, so limiting the areas available for investiga ...
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.