- University of Salford Institutional Repository
... radiation dose received by children. Discussion: Recent publications suggest that SAFIRE is capable of reducing image noise in CT images, thereby enabling the potential to reduce dose. Some publications suggest a decrease in dose, by up to 64% compared to filtered back projection, can be accomplishe ...
... radiation dose received by children. Discussion: Recent publications suggest that SAFIRE is capable of reducing image noise in CT images, thereby enabling the potential to reduce dose. Some publications suggest a decrease in dose, by up to 64% compared to filtered back projection, can be accomplishe ...
PET Phantom Instructions
... may need to be diluted to facilitate measurement because the concentration is often as high as 75 mCi/cc. For future reference, enter times into the table below. 2) Fill the phantom with water. Be sure that the Teflon cylinder on the faceplate is secure before fastening the faceplate to the phantom. ...
... may need to be diluted to facilitate measurement because the concentration is often as high as 75 mCi/cc. For future reference, enter times into the table below. 2) Fill the phantom with water. Be sure that the Teflon cylinder on the faceplate is secure before fastening the faceplate to the phantom. ...
Assessment of acute myocardial infarction: current status and
... in leads V1–V4 along with tall R waves and upright T waves in right precordial leads. In these cases, posterior leads V7 and V8 should demonstrate STsegment elevation and lead to the correct diagnosis. Patients with new or presumably new LBBB caused by AMI are at high risk; however, the presence of ...
... in leads V1–V4 along with tall R waves and upright T waves in right precordial leads. In these cases, posterior leads V7 and V8 should demonstrate STsegment elevation and lead to the correct diagnosis. Patients with new or presumably new LBBB caused by AMI are at high risk; however, the presence of ...
Radiological Protection in Cone Beam Computed Tomography
... recommendations and guidance on application of principles of radiological protection it establishes. This has been done through specific publications on the various uses of ionising radiation in medicine in various imaging and therapeutic modalities. This is in addition to the reports published by t ...
... recommendations and guidance on application of principles of radiological protection it establishes. This has been done through specific publications on the various uses of ionising radiation in medicine in various imaging and therapeutic modalities. This is in addition to the reports published by t ...
The Coalescence of the Foramen Lacerum Foramen Lacerum
... The foramen lacerum is generally a triangular-shaped bony foramen located between the sphenoid, apex of the petrous temporal, and basilar part of the occipital bones. The petrous portion of the internal carotid artery and carotid sympathetic nerve plexus passes through the carotid canal to reach the ...
... The foramen lacerum is generally a triangular-shaped bony foramen located between the sphenoid, apex of the petrous temporal, and basilar part of the occipital bones. The petrous portion of the internal carotid artery and carotid sympathetic nerve plexus passes through the carotid canal to reach the ...
Cone Beam Ct for Dental and Maxillofacial Radiology
... Medical imaging technology has advanced rapidly in the past decades, providing tremendous benefit to patients around the world. This development is very pronounced in the Computed Tomography (CT), which is today a well-established diagnostic tool in many areas of medicine. New applications of CT, so ...
... Medical imaging technology has advanced rapidly in the past decades, providing tremendous benefit to patients around the world. This development is very pronounced in the Computed Tomography (CT), which is today a well-established diagnostic tool in many areas of medicine. New applications of CT, so ...
Recommendations for the Evaluation of Left Ventricular Diastolic
... normal LV filling from pseudonormal filling (and whether restrictive LV filling is reversible or not) because a decrease in E/A ratio of $50%, not caused by E and A velocities fusion, is highly specific for increased LV filling pressures and supports the presence of diastolic dysfunction (Figures 5 ...
... normal LV filling from pseudonormal filling (and whether restrictive LV filling is reversible or not) because a decrease in E/A ratio of $50%, not caused by E and A velocities fusion, is highly specific for increased LV filling pressures and supports the presence of diastolic dysfunction (Figures 5 ...
Recommendations for the Evaluation of Left Ventricular Diastolic
... normal LV filling from pseudonormal filling (and whether restrictive LV filling is reversible or not) because a decrease in E/A ratio of $50%, not caused by E and A velocities fusion, is highly specific for increased LV filling pressures and supports the presence of diastolic dysfunction (Figures 5 ...
... normal LV filling from pseudonormal filling (and whether restrictive LV filling is reversible or not) because a decrease in E/A ratio of $50%, not caused by E and A velocities fusion, is highly specific for increased LV filling pressures and supports the presence of diastolic dysfunction (Figures 5 ...
MIRD Pamphlet No. 23: Quantitative SPECT for Patient
... absorbed dose to normal-organ or tumor volumes, and estimation of this quantity is based on the assumption of a uniform activity distribution within the source volumes. Furthermore, the calculation of the mean absorbed dose over the target volume is implicitly made assuming that this quantity is pre ...
... absorbed dose to normal-organ or tumor volumes, and estimation of this quantity is based on the assumption of a uniform activity distribution within the source volumes. Furthermore, the calculation of the mean absorbed dose over the target volume is implicitly made assuming that this quantity is pre ...
Biologically conformal radiation therapy and Monte
... changes in physical properties within patients. Additionally, tumor biology plays an important role in the diagnosis, treatment decisionmaking and the assessment of therapeutic response. Recent advances in biological imaging techniques, mainly based on positron emission tomography (PET), offer the o ...
... changes in physical properties within patients. Additionally, tumor biology plays an important role in the diagnosis, treatment decisionmaking and the assessment of therapeutic response. Recent advances in biological imaging techniques, mainly based on positron emission tomography (PET), offer the o ...
Positron Emission Tomography/Computed Tomography
... Although at least one PET scanner design continued to use NaI(Tl) until fairly recently, the majority of PET scanners installed during the 1990s were based on BGO block detectors. In the late 1990s, the introduction of new, faster scintillators such as gadolinium oxyorthosilicate (GSO)25 and lutetiu ...
... Although at least one PET scanner design continued to use NaI(Tl) until fairly recently, the majority of PET scanners installed during the 1990s were based on BGO block detectors. In the late 1990s, the introduction of new, faster scintillators such as gadolinium oxyorthosilicate (GSO)25 and lutetiu ...
ABR “Exam of the Future” Sharpens Focus on Images
... Approximate number, in thousands, of predicted deaths from prostate cancer in 2013, according to the National Cancer Institute. See Page 13 to learn about research, funded by the RSNA Research & Education (R&E) Foundation, that could improve image-guided radiation therapy for the disease. ...
... Approximate number, in thousands, of predicted deaths from prostate cancer in 2013, according to the National Cancer Institute. See Page 13 to learn about research, funded by the RSNA Research & Education (R&E) Foundation, that could improve image-guided radiation therapy for the disease. ...
Cone Beam Computed Tomography (CBCT) Dosimetry
... MC model of the OBI x-ray tube was built into the system and validated by measurements characterizing the cone beam quality in the aspects of the x-ray spectrum, half value layer (HVL) and dose profiles for both full-fan and half-fan modes. Using the validated MC model, CTDICB, dose profile integral ...
... MC model of the OBI x-ray tube was built into the system and validated by measurements characterizing the cone beam quality in the aspects of the x-ray spectrum, half value layer (HVL) and dose profiles for both full-fan and half-fan modes. Using the validated MC model, CTDICB, dose profile integral ...
Significant Coronary Artery Stenosis: Comparison on Per
... patients suspected of having coronary artery disease (CAD) is highly desirable to differentiate patients with from those without significant (ⱖ50%) stenosis (1). Currently, contrast material– enhanced multi– detector row computed tomographic (CT) angiography appears to provide the most promising com ...
... patients suspected of having coronary artery disease (CAD) is highly desirable to differentiate patients with from those without significant (ⱖ50%) stenosis (1). Currently, contrast material– enhanced multi– detector row computed tomographic (CT) angiography appears to provide the most promising com ...
Complementary Roles of Whole-Body Diffusion
... Learning Objectives: On successful completion of this activity, participants should be able to describe (1) the basic principles of DWI and (2) the current evidence on the correlation and comparison between 18F-FDG PET and DWI. Financial Disclosure: The authors of this article have indicated no rele ...
... Learning Objectives: On successful completion of this activity, participants should be able to describe (1) the basic principles of DWI and (2) the current evidence on the correlation and comparison between 18F-FDG PET and DWI. Financial Disclosure: The authors of this article have indicated no rele ...
Evaluation of Parotid Gland Function using Equivalent - J
... Safe imaging modalities are needed for evaluating parotid gland function. The aim of this study was to validate the utility of a magnetic resonance imaging (MRI) tool, equivalent cross-relaxation rate imaging (ECRI), as a measurement of parotid gland function after chemoradiotherapy. Subjects compri ...
... Safe imaging modalities are needed for evaluating parotid gland function. The aim of this study was to validate the utility of a magnetic resonance imaging (MRI) tool, equivalent cross-relaxation rate imaging (ECRI), as a measurement of parotid gland function after chemoradiotherapy. Subjects compri ...
Cone beam computed tomography: Adding three dimensions to
... effective dose (E) of radiation is the sum of weighted tissue or organ doses depending on the amount of specific tissue present in the FOV and their radiosensitivity.[3] International Commission on Radiological Protection has specified the tissues/organs to be used for effective dose calculation. The ...
... effective dose (E) of radiation is the sum of weighted tissue or organ doses depending on the amount of specific tissue present in the FOV and their radiosensitivity.[3] International Commission on Radiological Protection has specified the tissues/organs to be used for effective dose calculation. The ...
Signals Newsletter
... office for two to three weeks; however, that time period has strung itself out to the present time. While I have been able to work on my computer from bed during most of the past year, I have also required three more surgeries further complicating my duties. My appreciation and gratitude goes out to ...
... office for two to three weeks; however, that time period has strung itself out to the present time. While I have been able to work on my computer from bed during most of the past year, I have also required three more surgeries further complicating my duties. My appreciation and gratitude goes out to ...
Cone-Beam Computed Tomography Examinations of
... risk is determined by the cumulative dose of lifetime exposures to ionising radiation. For an individual, the risk of stochastic effects can be regarded as relatively small even in the case of relatively high cumulative doses. [66, p. 45] However, stochastic effects can lead to a significant health ...
... risk is determined by the cumulative dose of lifetime exposures to ionising radiation. For an individual, the risk of stochastic effects can be regarded as relatively small even in the case of relatively high cumulative doses. [66, p. 45] However, stochastic effects can lead to a significant health ...
M u l t i d e t e c... C T o f S o l i t a... P u l m o n a r y N... *, Bradley S. Sabloff,
... The adjective small is occasionally used to characterize a nodule with a maximum diameter of less than 1 cm.1 With the increasing use of multidetector CT (MDCT), small nodules are being detected with increasing frequency. In one screening study, the majority of patients who were screened had at leas ...
... The adjective small is occasionally used to characterize a nodule with a maximum diameter of less than 1 cm.1 With the increasing use of multidetector CT (MDCT), small nodules are being detected with increasing frequency. In one screening study, the majority of patients who were screened had at leas ...
Radiological examination of the articular eminence
... Objective: The purpose of the present study was to investigate the articular eminence inclination and height according to age and gender in patients with temporomandibular joint (TMJ) dysfunction and healthy controls using cone beam CT (CBCT). Methods: The measurements were performed on CBCT records ...
... Objective: The purpose of the present study was to investigate the articular eminence inclination and height according to age and gender in patients with temporomandibular joint (TMJ) dysfunction and healthy controls using cone beam CT (CBCT). Methods: The measurements were performed on CBCT records ...
Assessment of global left ventricular function and volumes with 320
... The assessment of global left ventricular (LV) function and volumes is important in patients with coronary artery disease (CAD) and serves as a valuable diagnostic and prognostic marker.1,2 There are several noninvasive imaging modalities to analyze cardiac function, which include two-dimensional (2 ...
... The assessment of global left ventricular (LV) function and volumes is important in patients with coronary artery disease (CAD) and serves as a valuable diagnostic and prognostic marker.1,2 There are several noninvasive imaging modalities to analyze cardiac function, which include two-dimensional (2 ...
Calculation, verification and monitoring of patient dose in Diagnostic
... of a variety of medical conditions. Different imaging modalities and complexities of examinations mean that some procedures contribute more to patient dose than others. Figure 1 shows the contribution of the collective dose from the 15 diagnostic examinations which provided the largest contribution ...
... of a variety of medical conditions. Different imaging modalities and complexities of examinations mean that some procedures contribute more to patient dose than others. Figure 1 shows the contribution of the collective dose from the 15 diagnostic examinations which provided the largest contribution ...
Honored Lecture 2012 du RSNA congrès
... manuscript reviewer for Radiology and RadioGraphics. Dr. Barentsz is an associate editor of Radiology and served on the RSNA Oncologic Imaging and Therapies Task Force. The Society of Gastrointestinal Radiologists and the Society of Uroradiology recently merged to form the Society of Abdominal Rad ...
... manuscript reviewer for Radiology and RadioGraphics. Dr. Barentsz is an associate editor of Radiology and served on the RSNA Oncologic Imaging and Therapies Task Force. The Society of Gastrointestinal Radiologists and the Society of Uroradiology recently merged to form the Society of Abdominal Rad ...
Measurement of the Normal Optic Chiasm on Coronal
... Presumably, thinner sections would increase edge sharpness and decrease measuring error even more, but they would be impractical from a time-management standpoint as well as for decreasing the signal-to-noise ratio. In the nine patients who were imaged more than once, the values obtained from the di ...
... Presumably, thinner sections would increase edge sharpness and decrease measuring error even more, but they would be impractical from a time-management standpoint as well as for decreasing the signal-to-noise ratio. In the nine patients who were imaged more than once, the values obtained from the di ...
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.