Diagnostic Reference Levels in Medical Imaging
... 1950s, national surveys of such quantities for diagnostic x-ray examinations were performed in the United States and the United Kingdom. In the 1970s, the Nationwide Evaluation of XRay Trends (NEXT) surveys began in the United States and in the 1980s the National Radiation Protection Board (NRPB, no ...
... 1950s, national surveys of such quantities for diagnostic x-ray examinations were performed in the United States and the United Kingdom. In the 1970s, the Nationwide Evaluation of XRay Trends (NEXT) surveys began in the United States and in the 1980s the National Radiation Protection Board (NRPB, no ...
Radiation Dose and Image Quality in Computed
... The aim of this study was to evaluate and compare the radiation doses imparted to patients undergoing computed tomography (CT) examinations and image quality with the use of automatic exposure control (AEC) and fixed tube current (FTC) techniques using a head and body phantom in a Siemens emotion 16 ...
... The aim of this study was to evaluate and compare the radiation doses imparted to patients undergoing computed tomography (CT) examinations and image quality with the use of automatic exposure control (AEC) and fixed tube current (FTC) techniques using a head and body phantom in a Siemens emotion 16 ...
New dimensions in endodontic imaging: Part 2. Cone beam
... skeleton at a considerably lower radiation dose than conventional computed tomography (CT) (Mozzo et al. 1998, Arai et al. 2001). With CBCT, a three-dimensional volume of data is acquired in the course of a single sweep of the scanner, using a simple, direct relationship between sensor and source, w ...
... skeleton at a considerably lower radiation dose than conventional computed tomography (CT) (Mozzo et al. 1998, Arai et al. 2001). With CBCT, a three-dimensional volume of data is acquired in the course of a single sweep of the scanner, using a simple, direct relationship between sensor and source, w ...
Imaging of knee injuries with special focus on tibial plateau
... the gold standard in Study I, and MRI the gold standard in Studies II, III, and IV. Arthroscopy was considered the standard of reference in Study III for some of the patients. Study I showed that radiography in two views had a sensitivity of only 83%, and their negative predictive value was 49%. Rad ...
... the gold standard in Study I, and MRI the gold standard in Studies II, III, and IV. Arthroscopy was considered the standard of reference in Study III for some of the patients. Study I showed that radiography in two views had a sensitivity of only 83%, and their negative predictive value was 49%. Rad ...
Scientific and Educational Exhibits
... Purpose: Due to severe portal hypertension, portal collateral circulation often develops in patients with end-stage chronic liver disease. The purpose of this study is to evaluate change in the collateral circulation volume between before and after liver transplantation. Methods and Materials: Using ...
... Purpose: Due to severe portal hypertension, portal collateral circulation often develops in patients with end-stage chronic liver disease. The purpose of this study is to evaluate change in the collateral circulation volume between before and after liver transplantation. Methods and Materials: Using ...
19 Imaging Features of Hepatic Metastases: CT and MR
... of liver metastases indicates non-resectability of the primary tumor for oncologic reasons. In these patients, chemotherapy may be sought. On the other hand colorectal cancer is the prototype of malignant disease, in which the presence of limited metastatic disease does not preclude surgery. Exact k ...
... of liver metastases indicates non-resectability of the primary tumor for oncologic reasons. In these patients, chemotherapy may be sought. On the other hand colorectal cancer is the prototype of malignant disease, in which the presence of limited metastatic disease does not preclude surgery. Exact k ...
Review Article Use of Cone Beam Computed Tomography in
... dose for imaging of the head include the bone marrow, thyroid, esophagus, skin, bone surface, salivary glands, brain, and “remainder” tissues [16]. Published effective doses for digital panoramic radiographs range from 5.5 to 22.0 μSv [17], while digital cephalometric radiographs have effective doses ...
... dose for imaging of the head include the bone marrow, thyroid, esophagus, skin, bone surface, salivary glands, brain, and “remainder” tissues [16]. Published effective doses for digital panoramic radiographs range from 5.5 to 22.0 μSv [17], while digital cephalometric radiographs have effective doses ...
Reversible Rapid Neck Swelling Following Carotid Artery Stenting
... There is suggestion of a higher chance of arterial injury related to carotid stenting for radiation-induced strictures. In a case report by Bates and Almehmi et al, a 56-year-old male who underwent carotid stenting for a radiation-induced carotid artery stenosis developed two aneurysmal dilations: o ...
... There is suggestion of a higher chance of arterial injury related to carotid stenting for radiation-induced strictures. In a case report by Bates and Almehmi et al, a 56-year-old male who underwent carotid stenting for a radiation-induced carotid artery stenosis developed two aneurysmal dilations: o ...
MR Angiography of the Portal Venous System
... When performing 3D CE MR portography some important technical issues have to be considered. By the time a conventional extracellular MR-contrast agents reaches the portal vein, it is considerably diluted. This dilution is caused by the contrast extraction at the capillary level for redistribution in ...
... When performing 3D CE MR portography some important technical issues have to be considered. By the time a conventional extracellular MR-contrast agents reaches the portal vein, it is considerably diluted. This dilution is caused by the contrast extraction at the capillary level for redistribution in ...
cone beam ct: non-dental applications
... Conventional lateral cephalograms were used for many years for ortho dontic assessment, treatment and follow-up. On these 2D projection images both the bony structures and the overlying soft tissues could be evaluated and measured prior to surgery or non-surgical orthodontic treatment. Maxillofacia ...
... Conventional lateral cephalograms were used for many years for ortho dontic assessment, treatment and follow-up. On these 2D projection images both the bony structures and the overlying soft tissues could be evaluated and measured prior to surgery or non-surgical orthodontic treatment. Maxillofacia ...
Breast Imaging For Screening And Diagnosing Cancer
... Electrical impedance scanning (EIS) is unproven and not medically necessary for the detection of breast cancer. There is insufficient evidence that EIS is effective in detecting malignant breast tissue. Evaluation of sensitivity and negative predictive value for EIS is inconsistent. Well-designed st ...
... Electrical impedance scanning (EIS) is unproven and not medically necessary for the detection of breast cancer. There is insufficient evidence that EIS is effective in detecting malignant breast tissue. Evaluation of sensitivity and negative predictive value for EIS is inconsistent. Well-designed st ...
radiation medicine qa
... To our customers’ utmost satisfaction and in the service of medical technology, PTW has committed itself to the design, development and production of high quality devices and systems. To do justice to these high expectations, PTW introduced a system of quality assurance at an early stage, which meet ...
... To our customers’ utmost satisfaction and in the service of medical technology, PTW has committed itself to the design, development and production of high quality devices and systems. To do justice to these high expectations, PTW introduced a system of quality assurance at an early stage, which meet ...
ASNC Model Coverage Policy - American Society of Nuclear
... should not be used as a finalized comprehensive tool. This model coverage policy will change as technologies and best practices evolve over time. In addition, clinical decision-making regarding the application of cardiac PET for a given patient should, first and foremost, remain with the physician t ...
... should not be used as a finalized comprehensive tool. This model coverage policy will change as technologies and best practices evolve over time. In addition, clinical decision-making regarding the application of cardiac PET for a given patient should, first and foremost, remain with the physician t ...
rajiv gandhi university of health sciences, bangalore
... underwent both sonography and arthrography. Compared with arthrography alone, ultrasound examinations enabled detection of 92% of rotator cuff tears (24 of 26 tears), with a specificity of 84% and a negative predictive value of 95%. Correlation was obtained in 30 of these patients who underwent surg ...
... underwent both sonography and arthrography. Compared with arthrography alone, ultrasound examinations enabled detection of 92% of rotator cuff tears (24 of 26 tears), with a specificity of 84% and a negative predictive value of 95%. Correlation was obtained in 30 of these patients who underwent surg ...
Cécile BOPP Le proton : sonde dosimétrique et diagnostique
... 2.3 The second era of proton imaging - treatment planning and quality assurance 2.3.1 Proton computed tomography for imaging the relative stopping power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3.2 Proton tomographs . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ...
... 2.3 The second era of proton imaging - treatment planning and quality assurance 2.3.1 Proton computed tomography for imaging the relative stopping power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3.2 Proton tomographs . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ...
Principles and clinical application of ultrasound - e
... issue of intra- or inter-observer variability among pathologists in evaluating the grade of fibrosis is an additional limitation because the interpretation process is a subjective and semi-quantified method [4]. According to previous research on chronic hepatitis C, agreement among pathologists rega ...
... issue of intra- or inter-observer variability among pathologists in evaluating the grade of fibrosis is an additional limitation because the interpretation process is a subjective and semi-quantified method [4]. According to previous research on chronic hepatitis C, agreement among pathologists rega ...
Are gadolinium-based contrast media really safer than iodinated
... § Iohexol 140 mg iodine per milliliter diluted with saline. ...
... § Iohexol 140 mg iodine per milliliter diluted with saline. ...
Full Text - Digital Access to Scholarship at Harvard
... University Hospitals Case Medical Center, Cleveland, OH, USA J. H. C. Reiber (&) Division of Image Processing (LKEB), Department of Radiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands e-mail: [email protected] ...
... University Hospitals Case Medical Center, Cleveland, OH, USA J. H. C. Reiber (&) Division of Image Processing (LKEB), Department of Radiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands e-mail: [email protected] ...
An X-ray Source Model and Characterization Method for Computing
... I would first like to thank Dr. Alexei Kouznetsov, who coded the first implementation of the software I used in this project. Through our close collaboration, I was able to devise a kv x-ray source characterization method and model that is easy to implement in a clinical medical physics setting. I w ...
... I would first like to thank Dr. Alexei Kouznetsov, who coded the first implementation of the software I used in this project. Through our close collaboration, I was able to devise a kv x-ray source characterization method and model that is easy to implement in a clinical medical physics setting. I w ...
Cardiac involvement in sarcoidosis
... Cardiac sarcoidosis was first described by Bernstein et al. [2] in an autopsy case. A period of 4 yrs later, Schaumann [3] demonstrated cardiac involvement in two further autopsy cases. In 1937, Gentzen [4] reported about giant cell granulomas in two patients with endomyocardial fibrosis, which was ...
... Cardiac sarcoidosis was first described by Bernstein et al. [2] in an autopsy case. A period of 4 yrs later, Schaumann [3] demonstrated cardiac involvement in two further autopsy cases. In 1937, Gentzen [4] reported about giant cell granulomas in two patients with endomyocardial fibrosis, which was ...
EANM/ESC guidelines for radionuclide imaging of cardiac function
... etc. Furthermore, new modalities or development within a modality [gating of MPS, cardiac CT, contrast MRI (cMRI), echocardiography, plasma atrial and brain natriuretic peptides (ANP and BNP)] may have a great impact on the clinical indications for alternative techniques. The most important indicati ...
... etc. Furthermore, new modalities or development within a modality [gating of MPS, cardiac CT, contrast MRI (cMRI), echocardiography, plasma atrial and brain natriuretic peptides (ANP and BNP)] may have a great impact on the clinical indications for alternative techniques. The most important indicati ...
(MRI) of the Soft - American College of Radiology
... of the patient, limitations of available resources, or advances in knowledge or technology subsequent to publication of this document. However, a practitioner who employs an approach substantially different from the guidance in this document is advised to document in the patient record information s ...
... of the patient, limitations of available resources, or advances in knowledge or technology subsequent to publication of this document. However, a practitioner who employs an approach substantially different from the guidance in this document is advised to document in the patient record information s ...
code of safe practice for the use of
... Protection of persons holding patients or image receptors 3.22 No person shall hold a patient, x-ray film cassette, or other imaging equipment or x-ray tube head in position during exposures unless it is otherwise impossible to obtain a diagnostically useful image and not merely that it is a matter ...
... Protection of persons holding patients or image receptors 3.22 No person shall hold a patient, x-ray film cassette, or other imaging equipment or x-ray tube head in position during exposures unless it is otherwise impossible to obtain a diagnostically useful image and not merely that it is a matter ...
A literature review of electronic portal imaging for
... Electronic portal imaging devices (EPIDs) have been the preferred tools for verification of patient positioning for radiotherapy in recent decades. Since EPID images contain dose information, many groups have investigated their use for radiotherapy dose measurement. With the introduction of the amor ...
... Electronic portal imaging devices (EPIDs) have been the preferred tools for verification of patient positioning for radiotherapy in recent decades. Since EPID images contain dose information, many groups have investigated their use for radiotherapy dose measurement. With the introduction of the amor ...
Chapter 540: Radiology, Nuclear Medicine and Radiation Oncology
... units at many facilities, the increasing proliferation of hybrid equipment and integrated care will make the coordination of these programs increasingly important over time. Additionally, these three departments are addressed in a common chapter due to the additional levels of complexity associated ...
... units at many facilities, the increasing proliferation of hybrid equipment and integrated care will make the coordination of these programs increasingly important over time. Additionally, these three departments are addressed in a common chapter due to the additional levels of complexity associated ...
Neutron capture therapy of cancer
Neutron capture therapy (NCT) is a noninvasive therapeutic modality for treating locally invasive malignant tumors such as primary brain tumors and recurrent head and neck cancer. It is a two step procedure: first, the patient is injected with a tumor localizing drug containing a non-radioactive isotope that has a high propensity or cross section (σ) to capture slow neutrons. The cross section of the capture agent is many times greater than that of the other elements present in tissues such as hydrogen, oxygen, and nitrogen. In the second step, the patient is radiated with epithermal neutrons, which after losing energy as they penetrate tissue, are absorbed by the capture agent which subsequently emits high-energy charged particles, thereby resulting in a biologically destructive nuclear reaction (Fig.1).All of the clinical experience to date with NCT is with the non-radioactive isotope boron-10, and this is known as boron neutron capture therapy (BNCT). At this time, the use of other non-radioactive isotopes, such as gadolinium, has been limited, and to date, it has not been used clinically. BNCT has been evaluated clinically as an alternative to conventional radiation therapy for the treatment of malignant brain tumors (gliomas), and more recently, recurrent, locally advanced head and neck cancer.