Evaluation of image quality and patient radiation dose in digital
... Only a few years ago, flat-panel detectors with integrated read-out mechanisms became commercially available for implementation in digital radiography applications. The latter detectors provide an instant image display and use a thin-film transistor array for signal transport. Conversion of x-rays i ...
... Only a few years ago, flat-panel detectors with integrated read-out mechanisms became commercially available for implementation in digital radiography applications. The latter detectors provide an instant image display and use a thin-film transistor array for signal transport. Conversion of x-rays i ...
1 The Nature of Biomedical Images
... Application for the detection of breast cancer: Nitrogen-rich compounds preferentially absorb (or attenuate) infrared radiation. The fat and fibroglandular tissue in the mature breast contain much less nitrogen than malignant tissues. The hemoglobin in blood has a high nitrogen content, and tumors a ...
... Application for the detection of breast cancer: Nitrogen-rich compounds preferentially absorb (or attenuate) infrared radiation. The fat and fibroglandular tissue in the mature breast contain much less nitrogen than malignant tissues. The hemoglobin in blood has a high nitrogen content, and tumors a ...
Sixty-Four-Section Multidetector CT Angiography of Carotid Arteries
... Image Quality and Artifacts BACKGROUND AND PURPOSE: Sixty-four-section CT scanners have recently been introduced for vascular imaging. Before such scanners reach widespread use, scanning protocol should be optimized and image quality assessed. The goals of this study were to systematically measure i ...
... Image Quality and Artifacts BACKGROUND AND PURPOSE: Sixty-four-section CT scanners have recently been introduced for vascular imaging. Before such scanners reach widespread use, scanning protocol should be optimized and image quality assessed. The goals of this study were to systematically measure i ...
Axially Extended-Volume C-Arm CT Using a Reverse Helical
... because it is difficult to perform a single scan that simultaneously provides information for trajectory calibration and tomographic data of the patient. C-arm CT usually performs trajectory calibration once and uses the calibrated trajectory in subsequent tomographic scans. Fourth, there is the iss ...
... because it is difficult to perform a single scan that simultaneously provides information for trajectory calibration and tomographic data of the patient. C-arm CT usually performs trajectory calibration once and uses the calibrated trajectory in subsequent tomographic scans. Fourth, there is the iss ...
Sixty-Four-Section Multidetector CT Angiography of Carotid Arteries
... the base of the heart through the cerebral vertex, and 4) contrastenhanced head CT. Following the unenhanced head CT, perfusion CT is performed at 2 levels, that of the third ventricle and again more cephalad at a point above the lateral ventricles. At each level, 40-mL iodinated contrast material ( ...
... the base of the heart through the cerebral vertex, and 4) contrastenhanced head CT. Following the unenhanced head CT, perfusion CT is performed at 2 levels, that of the third ventricle and again more cephalad at a point above the lateral ventricles. At each level, 40-mL iodinated contrast material ( ...
Medical image registration
... imaging, and that there is no substantial change in anatomy and pathology, such as growth in a lesion, between scans. Imaging equipment is imperfect, so regardless of the organ being imaged, the rigid body assumption can be violated as a result of scanner-induced geometrical distortions that differ ...
... imaging, and that there is no substantial change in anatomy and pathology, such as growth in a lesion, between scans. Imaging equipment is imperfect, so regardless of the organ being imaged, the rigid body assumption can be violated as a result of scanner-induced geometrical distortions that differ ...
Medical image registration
... imaging, and that there is no substantial change in anatomy and pathology, such as growth in a lesion, between scans. Imaging equipment is imperfect, so regardless of the organ being imaged, the rigid body assumption can be violated as a result of scanner-induced geometrical distortions that differ ...
... imaging, and that there is no substantial change in anatomy and pathology, such as growth in a lesion, between scans. Imaging equipment is imperfect, so regardless of the organ being imaged, the rigid body assumption can be violated as a result of scanner-induced geometrical distortions that differ ...
CT Angiography of Peripheral Arterial Disease
... * Sixty-four– channel GE scanners not been used in practice by the authors at time of writing. † Scan times shown for a scanning range of 130 cm. ‡ Physical detector configuration is 32 detector rows. § Scan time fixed to 40 sec. ...
... * Sixty-four– channel GE scanners not been used in practice by the authors at time of writing. † Scan times shown for a scanning range of 130 cm. ‡ Physical detector configuration is 32 detector rows. § Scan time fixed to 40 sec. ...
Detection and Evaluation of a Palpable Breast Mass
... view should reveal the deep, medial, and lateral breast tissue. Women presenting with a breast mass must undergo bilateral diagnostic mammography. Diagnostic mammography can be performed in women at any age; however, in women younger than 40 years, the dense glandular breast tissue lowers the sensit ...
... view should reveal the deep, medial, and lateral breast tissue. Women presenting with a breast mass must undergo bilateral diagnostic mammography. Diagnostic mammography can be performed in women at any age; however, in women younger than 40 years, the dense glandular breast tissue lowers the sensit ...
Author`s personal copy - Krankenhaus Rummelsberg
... patient positioning is the fastest and no further adjustments are needed so that only pressing a button is necessary to perform the scan. 4.2. Angle measurement – differences between methods The angles differed between radiographs, CT and pedCAT. The difference as such is a fact but the difference d ...
... patient positioning is the fastest and no further adjustments are needed so that only pressing a button is necessary to perform the scan. 4.2. Angle measurement – differences between methods The angles differed between radiographs, CT and pedCAT. The difference as such is a fact but the difference d ...
Chapter 540: Radiology, Nuclear Medicine and Radiation Oncology
... covered in other Space Planning Criteria chapters. For example, the Emergency Department (Chapter 350) provides CT and General Radiology rooms, while Women’s Health (Chapter 360) provides Mammography, Fluoroscopy, Ultrasound, DEXA and Stereotactic Biopsy rooms. Care must be taken to avoid duplicate ...
... covered in other Space Planning Criteria chapters. For example, the Emergency Department (Chapter 350) provides CT and General Radiology rooms, while Women’s Health (Chapter 360) provides Mammography, Fluoroscopy, Ultrasound, DEXA and Stereotactic Biopsy rooms. Care must be taken to avoid duplicate ...
Scientific and Educational Exhibits
... ducts, as seen at MR cholangiopancreatography, emphasizing their clinical relevance for surgical interventions. Background: During the past decade, the increasing number of hepatobiliary surgical procedures, mainly laparoscopic cholecystectomies but also liver transplantations, has been associated w ...
... ducts, as seen at MR cholangiopancreatography, emphasizing their clinical relevance for surgical interventions. Background: During the past decade, the increasing number of hepatobiliary surgical procedures, mainly laparoscopic cholecystectomies but also liver transplantations, has been associated w ...
MPI MAA KIT - Nuclear Education Online
... stannous and stannic chloride 0.11 mg) and 1.2 mg of sodium chloride; the contents are in a lyophilized form under an atmosphere of nitrogen. Sodium hydroxide or hydrochloric acid has been used for pH adjustment. No bacteriostatic preservative is present. The Albumin Human was non-reactive when test ...
... stannous and stannic chloride 0.11 mg) and 1.2 mg of sodium chloride; the contents are in a lyophilized form under an atmosphere of nitrogen. Sodium hydroxide or hydrochloric acid has been used for pH adjustment. No bacteriostatic preservative is present. The Albumin Human was non-reactive when test ...
Mammograms and Other Breast Imaging Procedures
... women feel very comfortable doing BSE (which is a systematic, step-by-step approach to looking at and feeling one's breasts) regularly, usually monthly. Other women are more comfortable simply looking and feeling their breasts in a less systematic approach, such as while showering or getting dressed ...
... women feel very comfortable doing BSE (which is a systematic, step-by-step approach to looking at and feeling one's breasts) regularly, usually monthly. Other women are more comfortable simply looking and feeling their breasts in a less systematic approach, such as while showering or getting dressed ...
pdf
... claims, damages, costs, and expenses, including attorneys' fees, arising from or related to your use of these pages. Please note: Links to movies, ppt slideshows and any other multimedia files are not available in the pdf version of presentations. www.myESR.org ...
... claims, damages, costs, and expenses, including attorneys' fees, arising from or related to your use of these pages. Please note: Links to movies, ppt slideshows and any other multimedia files are not available in the pdf version of presentations. www.myESR.org ...
Imaging of the anterior abdominal wall: A radiological
... anterior aspect of pelvic bones. It is composed of several layers including skin, superficial fascia, subcutaneous fat, anterolateral and midline muscle groups, transversalis fascia, extraperitoneal fat and peritoneum. The superficial fascia is a single layer containing variable amount of fat. Infer ...
... anterior aspect of pelvic bones. It is composed of several layers including skin, superficial fascia, subcutaneous fat, anterolateral and midline muscle groups, transversalis fascia, extraperitoneal fat and peritoneum. The superficial fascia is a single layer containing variable amount of fat. Infer ...
Intrinsic respiratory gating in small-animal CT
... every respiratory cycle for extrinsic gating by analysing the compression of the respiratory cushion and for intrinsic gating by analysing the parameter P derived from raw projections. All other steps, such as retrospective binning of projections from several rotations according to their phase, and ...
... every respiratory cycle for extrinsic gating by analysing the compression of the respiratory cushion and for intrinsic gating by analysing the parameter P derived from raw projections. All other steps, such as retrospective binning of projections from several rotations according to their phase, and ...
Chapter 15 SPECIAL PROCEDURES AND TECHNIQUES IN
... gamma unit requires a much larger effort as well as a very stringent and disciplined quality assurance programme. Owing to the intricacies of the specific dose delivery methods, the potential for serious problems, like a geographic miss, is greater on a linac than on a gamma unit. However, radiosurg ...
... gamma unit requires a much larger effort as well as a very stringent and disciplined quality assurance programme. Owing to the intricacies of the specific dose delivery methods, the potential for serious problems, like a geographic miss, is greater on a linac than on a gamma unit. However, radiosurg ...
Attenuation, Scatter, and Spatial Resolution Compensation in SPECT
... accurate only for a mono-energetic photon beam, and under the assumption that as soon as a photon undergoes any interaction, it is no longer counted as a member of the beam. The latter is the "good geometry" condition [4,5]. The attenuated projections are obtained from the ideal projections by inclu ...
... accurate only for a mono-energetic photon beam, and under the assumption that as soon as a photon undergoes any interaction, it is no longer counted as a member of the beam. The latter is the "good geometry" condition [4,5]. The attenuated projections are obtained from the ideal projections by inclu ...
Troubleshooting Manual
... Check that: Site’s circuit breakers are ok Mains cables are connected inside the OP100 and the unit is properly connected to the mains voltage. Mains fuses are ok and have the correct rating. ...
... Check that: Site’s circuit breakers are ok Mains cables are connected inside the OP100 and the unit is properly connected to the mains voltage. Mains fuses are ok and have the correct rating. ...
Three-Dimensional Analysis of Left Ventricular Geometry Using
... remains questionable. This study evaluated the feasibility of three-dimensional left ventricular geometric analysis using magnetic resonance imaging (MRI). Methods. Echocardiography and MRI were performed on 55 patients with hypertension. LVM was calculated using 0.8 (American Society of Echocardiog ...
... remains questionable. This study evaluated the feasibility of three-dimensional left ventricular geometric analysis using magnetic resonance imaging (MRI). Methods. Echocardiography and MRI were performed on 55 patients with hypertension. LVM was calculated using 0.8 (American Society of Echocardiog ...
Low insertion of a cystic duct into the common bile duct as a cause
... reconstructions show: (a & b) the stent within the dilated cystic duct. Note that the superior end of the stent points towards the GB neck, with the inferior end in the third part of the duodenum; (c) the dilated CBD containing two radiopaque ...
... reconstructions show: (a & b) the stent within the dilated cystic duct. Note that the superior end of the stent points towards the GB neck, with the inferior end in the third part of the duodenum; (c) the dilated CBD containing two radiopaque ...
Left ventricular function in patients with coronary artery
... the ejection fractions obtained with the contrast ventriculographic, first-pass and myocardial perfusion image inversion techniques. The significance of differences between r values were then determined by using the Fisher z-transformation. Systematic error among ejection fractions determined with e ...
... the ejection fractions obtained with the contrast ventriculographic, first-pass and myocardial perfusion image inversion techniques. The significance of differences between r values were then determined by using the Fisher z-transformation. Systematic error among ejection fractions determined with e ...
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.