Cone beam computed tomography - Its applications
... to imaging the maxillofacial region heralds a true paradigm shift from 2D to an alternative 3D which compensates for the shortcomings of other 3D imaging options.[1,2] CBCT imaging employs shaped source of ionizing radiation in the form of a divergent pyramidal or cone shape which is directed throug ...
... to imaging the maxillofacial region heralds a true paradigm shift from 2D to an alternative 3D which compensates for the shortcomings of other 3D imaging options.[1,2] CBCT imaging employs shaped source of ionizing radiation in the form of a divergent pyramidal or cone shape which is directed throug ...
IN THE BEGINNING
... • Breast cancer cells take up the radioactive substance much more than normal cells do • A nuclear medicine scanner that scans the breast looking for areas where the radioactive substance is concentrated ...
... • Breast cancer cells take up the radioactive substance much more than normal cells do • A nuclear medicine scanner that scans the breast looking for areas where the radioactive substance is concentrated ...
Adaptive Iterative Reconstruction in CT: What Does It
... different look and to gain confidence in the diagnostic capability. Typically, after about 90 days, many radiologists hardly notice the difference in image appearance. The implementation of iterative reconstruction can be an important component of overall CT radiation dose reduction – Imaging Wisely ...
... different look and to gain confidence in the diagnostic capability. Typically, after about 90 days, many radiologists hardly notice the difference in image appearance. The implementation of iterative reconstruction can be an important component of overall CT radiation dose reduction – Imaging Wisely ...
MD Radio-Diagnosis Curriculum and Syllabus 2011 Branch Code: 24
... enterolysis) and enema (both conventional and double contrast) for colon. It alo includes examination of liver, biliary system and pancreas using all the imaging modalities available to a radiologist including specialized investigations like ERCP, PTC and interventional procedures like abscess drain ...
... enterolysis) and enema (both conventional and double contrast) for colon. It alo includes examination of liver, biliary system and pancreas using all the imaging modalities available to a radiologist including specialized investigations like ERCP, PTC and interventional procedures like abscess drain ...
The big question: CT, MRI or nuclear for coronary
... to cook it from the inside. This is not radiation oncology, but interventional radiology, so there are areas where we overlap. It is sometimes said that we are in competition, but this is simply because we don’t know each other well enough. Working in partnership, with a beer understanding of our p ...
... to cook it from the inside. This is not radiation oncology, but interventional radiology, so there are areas where we overlap. It is sometimes said that we are in competition, but this is simply because we don’t know each other well enough. Working in partnership, with a beer understanding of our p ...
Comprehensive imaging of cortical networks
... These methods can dramatically improve signal levels for small structures that are on the order of or smaller than the two-photon excitation volume, such as spines and axons, but have more modest effects on images of larger structures [62]. Wave front engineering can also correct for strong local s ...
... These methods can dramatically improve signal levels for small structures that are on the order of or smaller than the two-photon excitation volume, such as spines and axons, but have more modest effects on images of larger structures [62]. Wave front engineering can also correct for strong local s ...
Clinical Aspects of General Nuclear Medicine
... In the simplest terms, reducing administered activity will lower the count rate. If the examination’s other acquisition parameters are unchanged, this may result in reduced visibility of the organ(s) of interest, increased image noise and limited detection of disease. If imaging times are increased ...
... In the simplest terms, reducing administered activity will lower the count rate. If the examination’s other acquisition parameters are unchanged, this may result in reduced visibility of the organ(s) of interest, increased image noise and limited detection of disease. If imaging times are increased ...
... The use of contrast material in thoracic MR is still a matter of controversy. Contrast-enhanced MR may be useful in pulmonary and mediastinal masses to detect necrosis or fibrosis [3–5, 7–13, 19, 20, 23, 28], and differential diagnosis may be improved [9–13]. Especially in pleural diseases, in pulmo ...
Düşük kilovolt prospektif EKG-Gated Koroner BT angiografi ile
... radiation doses when compared with conventional angiography preclude its wider application (1,4). Only few quantitative data on the dose-risk relation are available though effective dose and the risk of cancer induction is still a concern (5). Radiation dose for 64-slice CT is 1113.6 mSv (maximum va ...
... radiation doses when compared with conventional angiography preclude its wider application (1,4). Only few quantitative data on the dose-risk relation are available though effective dose and the risk of cancer induction is still a concern (5). Radiation dose for 64-slice CT is 1113.6 mSv (maximum va ...
Document
... • increased radiosensitivity of certain tissues, particularly in infancy • longer lifetime for radiation-related cancer to occur(慢 性效應) • The thyroid gland, breast tissue, and gonads are structures that have an increased sensitivity to radiation in growing children. ...
... • increased radiosensitivity of certain tissues, particularly in infancy • longer lifetime for radiation-related cancer to occur(慢 性效應) • The thyroid gland, breast tissue, and gonads are structures that have an increased sensitivity to radiation in growing children. ...
Revision 1 - American College of Radiology
... The American College of Radiology, with more than 30,000 members, is the principal organization of radiologists, radiation oncologists, and clinical medical physicists in the United States. The College is a nonprofit professional society whose primary purposes are to advance the science of radiology ...
... The American College of Radiology, with more than 30,000 members, is the principal organization of radiologists, radiation oncologists, and clinical medical physicists in the United States. The College is a nonprofit professional society whose primary purposes are to advance the science of radiology ...
A Hybrid Approach for Accurate Estimation of the Scatter
... images. Scatter removal is therefore mandatory in x-ray CT imaging because of the need to produce clinical images with acceptable low contrast detectability. Therefore, correcting these artifacts was targeted since the earliest designs of CT scanners, either by optimizing the design geometry or by u ...
... images. Scatter removal is therefore mandatory in x-ray CT imaging because of the need to produce clinical images with acceptable low contrast detectability. Therefore, correcting these artifacts was targeted since the earliest designs of CT scanners, either by optimizing the design geometry or by u ...
Radiology Order Entry - Mass General Imaging
... “physician scorecard” that reflects each physician’s overall performance in ordering examinations. Finally, rather than a go/no-go approach to a single order, our system simultaneously provides comparative scores for various examinations that might be ordered in the clinical context, thus serving as ...
... “physician scorecard” that reflects each physician’s overall performance in ordering examinations. Finally, rather than a go/no-go approach to a single order, our system simultaneously provides comparative scores for various examinations that might be ordered in the clinical context, thus serving as ...
MR Imaging of the Adnexal Masses: A Review
... adnexal origin can be imaged and a confident diagnosis can be made. MRI helps to delineate normal anatomical structures and elucidate the pathological lesions. It has high sensitivity and specificity for differentiating benign adnexal masses from malignant ones. This review article gives a brief acc ...
... adnexal origin can be imaged and a confident diagnosis can be made. MRI helps to delineate normal anatomical structures and elucidate the pathological lesions. It has high sensitivity and specificity for differentiating benign adnexal masses from malignant ones. This review article gives a brief acc ...
A study on the magnetic resonance imaging (MRI)
... of radiobiological parameters. To validate our procedure we compared MRI-only and CT + MRI-based plans. 2. Methods and materials 2.1. Data acquisition—CT and MRI scanning procedures We used data from four glioblastoma multiforme (GBM) patients. Each individual was subjected to two subsequent scannin ...
... of radiobiological parameters. To validate our procedure we compared MRI-only and CT + MRI-based plans. 2. Methods and materials 2.1. Data acquisition—CT and MRI scanning procedures We used data from four glioblastoma multiforme (GBM) patients. Each individual was subjected to two subsequent scannin ...
1 E. Mark Haacke, Ph.D. Professor of Radiology and Professor and
... part of this vascular study, we are considering the relationship between iron deposition and age since iron build up and vascular breakdown are both associated with Alzheimer’s disease. Iron deposition may in fact be related to endothelial health. The concept of treating the endothelium and vascular ...
... part of this vascular study, we are considering the relationship between iron deposition and age since iron build up and vascular breakdown are both associated with Alzheimer’s disease. Iron deposition may in fact be related to endothelial health. The concept of treating the endothelium and vascular ...
Ultrasonic and X-ray Tomographic Imaging of Highly Contrasting
... microstructure characterization of concrete usually have a large penetrating capability and high resolution up to 5-10 micrometers. Compared with other imaging methods, XCT has several advantages including the ability to acquire 3D data set, no need for sample preparation, and non-destruction to sui ...
... microstructure characterization of concrete usually have a large penetrating capability and high resolution up to 5-10 micrometers. Compared with other imaging methods, XCT has several advantages including the ability to acquire 3D data set, no need for sample preparation, and non-destruction to sui ...
Radiographic Imaging of Musculoskeletal Neoplasia
... Conversion of a bone lesion from relatively inactive to active on scintigraphy is generally suggestive of malignant transformation, although it may also be seen in lesions that are “burning out” (eg, nonossifying fibroma) or in cases of pathologic fracture. Bone scintigraphy is an excellent tool to ...
... Conversion of a bone lesion from relatively inactive to active on scintigraphy is generally suggestive of malignant transformation, although it may also be seen in lesions that are “burning out” (eg, nonossifying fibroma) or in cases of pathologic fracture. Bone scintigraphy is an excellent tool to ...
Reconstruction from Truncated Projections in Cone
... algorithm. It is an open benchmark for comparison of reconstruction performance using a high resolution C-arm CT data set of a rabbit. To evaluate the spatial resolution of the reconstructions with the new algorithm, we used projection images of the linepair insert of the Siemens cone-beam phantom a ...
... algorithm. It is an open benchmark for comparison of reconstruction performance using a high resolution C-arm CT data set of a rabbit. To evaluate the spatial resolution of the reconstructions with the new algorithm, we used projection images of the linepair insert of the Siemens cone-beam phantom a ...
Image Guided Radiation Therapy Guidelines: ATC QA
... variations in the way each step in this complex procedure can be handled results in a large number of different overall IGRT approaches. For example, orthogonal 2D images can be obtained each day to verify or correct the patient’s position, or a full volume image dataset can be used. Techniques such ...
... variations in the way each step in this complex procedure can be handled results in a large number of different overall IGRT approaches. For example, orthogonal 2D images can be obtained each day to verify or correct the patient’s position, or a full volume image dataset can be used. Techniques such ...
... dose involved in MDCT scans, the limited availability,and the increased costs impede its use in dentistry (5,6). In the late 1990s Italian and Japanese groups (Arai et al. 1999, Mozzo et al. 1998), working independently of each other, developed a new tomographic scanner known as cone beam computed t ...
Cochlear implantation with the BV Pulsera with - InCenter
... bone and implant detail, allowing the surgeon to assess the position of the implant in the cochlea. In a patient with meningitis, intraoperative 3D-RX assisted with the correction of the incorrect multi-electrode array position, and may have therefore avoided the need for revision surgery at a later ...
... bone and implant detail, allowing the surgeon to assess the position of the implant in the cochlea. In a patient with meningitis, intraoperative 3D-RX assisted with the correction of the incorrect multi-electrode array position, and may have therefore avoided the need for revision surgery at a later ...
Positron emission tomography
Positron emission tomography (PET) is a nuclear medicine, functional imaging technique that produces a three-dimensional image of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide (tracer), which is introduced into the body on a biologically active molecule. Three-dimensional images of tracer concentration within the body are then constructed by computer analysis. In modern PET-CT scanners, three dimensional imaging is often accomplished with the aid of a CT X-ray scan performed on the patient during the same session, in the same machine.If the biologically active molecule chosen for PET is fluorodeoxyglucose (FDG), an analogue of glucose, the concentrations of tracer imaged will indicate tissue metabolic activity as it corresponds to the regional glucose uptake. Use of this tracer to explore the possibility of cancer metastasis (i.e., spreading to other sites) is the most common type of PET scan in standard medical care (90% of current scans). However, on a minority basis, many other radioactive tracers are used in PET to image the tissue concentration of other types of molecules of interest. One of the disadvantages of PET scanners is their operating cost.