Dosimetry of 3 CBCT devices for oral and maxillofacial radiology
... included in the full FOV examinations produced by each unit. Midsagittal reconstructions resulting from these examinations can be seen in Figure 2. X-ray parameters of kV and mA are automatically determined from scout views by the NewTom 3G. Depending on the size of the patient and the extent of bea ...
... included in the full FOV examinations produced by each unit. Midsagittal reconstructions resulting from these examinations can be seen in Figure 2. X-ray parameters of kV and mA are automatically determined from scout views by the NewTom 3G. Depending on the size of the patient and the extent of bea ...
Radiation Protection and Dose Optimisation
... a neutron in the nucleus is converted into a proton and an electron, followed by ejection of the electron together with a neutrino (ν). The electron in this case is referred to as a β- particle while the neutrino is a “particle” that has no mass or electric charge. In the case of β+ decay, a proton ...
... a neutron in the nucleus is converted into a proton and an electron, followed by ejection of the electron together with a neutrino (ν). The electron in this case is referred to as a β- particle while the neutrino is a “particle” that has no mass or electric charge. In the case of β+ decay, a proton ...
Chapter 6 - VU-dare
... arrhythmia, pregnancy, renal insufficiency (serum creatinine> 110µmol/L), known allergy to iodinated contrast material, any absolute contra-indication for magnetic resonance imaging (e.g. cerebral clips), claustrophobia and asthma. All patients underwent cardiac computed tomography and CMR within 1 ...
... arrhythmia, pregnancy, renal insufficiency (serum creatinine> 110µmol/L), known allergy to iodinated contrast material, any absolute contra-indication for magnetic resonance imaging (e.g. cerebral clips), claustrophobia and asthma. All patients underwent cardiac computed tomography and CMR within 1 ...
Multiply Your Potential
... The SOMATOM® Definition Flash is in a league of its own. The generation of excited Flash users is continuously growing – not least because current Flash users are already purchasing their second, third, fourth, and even up to tenth system. The latest Dual Source Dual Energy CT scanner has the fastes ...
... The SOMATOM® Definition Flash is in a league of its own. The generation of excited Flash users is continuously growing – not least because current Flash users are already purchasing their second, third, fourth, and even up to tenth system. The latest Dual Source Dual Energy CT scanner has the fastes ...
Managing the imaging dose during Image-guided Radiotherapy Martin J Murphy PhD
... • not everyone has the same sensitivity – children are 10 times more sensitive than adults; girls are more sensitive than boys, women have different organ sensitivities than men. • Not everyone is in the same risk category – a seventy year old man undergoing image-guided prostate treatments is in an ...
... • not everyone has the same sensitivity – children are 10 times more sensitive than adults; girls are more sensitive than boys, women have different organ sensitivities than men. • Not everyone is in the same risk category – a seventy year old man undergoing image-guided prostate treatments is in an ...
Evaluation of the effect of ambrisentan on digital microvascular flow
... Endothelial injury is thought to precede loss of normal vasodilator response to nitric oxide and prostacyclin, leading to abnormal responses to vasoconstrictive mediators including endothelin-1 (ET-1) and catecholamines [4]. Serum ET-1 level is increased in SSc patients [5,6] making it a rational th ...
... Endothelial injury is thought to precede loss of normal vasodilator response to nitric oxide and prostacyclin, leading to abnormal responses to vasoconstrictive mediators including endothelin-1 (ET-1) and catecholamines [4]. Serum ET-1 level is increased in SSc patients [5,6] making it a rational th ...
Clinical Aspects of General Nuclear Medicine
... affect the examination’s imaging characteristics and may lower image quality. 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 ...
... affect the examination’s imaging characteristics and may lower image quality. 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 ...
MSc Medical Physics 2010-11 v2
... 7. Conduct a suitable range of diagnostic, investigative or monitoring procedures with due care for the safety of self and others. 8. Report problems and may take part in restorative action within quality control/assurance requirements to address threats of performance deterioration. 9. Work in part ...
... 7. Conduct a suitable range of diagnostic, investigative or monitoring procedures with due care for the safety of self and others. 8. Report problems and may take part in restorative action within quality control/assurance requirements to address threats of performance deterioration. 9. Work in part ...
A Review of the Concept and an Update of Selected Literature
... It is generally accepted that a variety of factors other than pathology can alter the “normal” biodistribution of radiopharmaceuticals. One such factor is drug therapy. A drug-induced modification in the biologic distribution of a radiopharmaceutical, that results in potential interference or confus ...
... It is generally accepted that a variety of factors other than pathology can alter the “normal” biodistribution of radiopharmaceuticals. One such factor is drug therapy. A drug-induced modification in the biologic distribution of a radiopharmaceutical, that results in potential interference or confus ...
Positron Emission Tomography in Urology - EU-ACME
... O, 13N, and 11C. The last few years also other, often generator-produced, positron emitters are being introduced as 68Ga, 82Rb, 89Zr, and 124I. The radiation resulting from this annihilation event can be detected with conventional gammacameras, but nowadays dedicated PET-cameras are widely available ...
... O, 13N, and 11C. The last few years also other, often generator-produced, positron emitters are being introduced as 68Ga, 82Rb, 89Zr, and 124I. The radiation resulting from this annihilation event can be detected with conventional gammacameras, but nowadays dedicated PET-cameras are widely available ...
(mIBG) Scintigraphy - Society of Nuclear Medicine
... patients. This guideline describes the mIBG scintigraphy protocol currently used in the clinical routine, but does not include all existing procedures for neuroendocrine tumours. It should therefore not be taken as exclusive of other nuclear medicine modalities that can be used to obtain comparable ...
... patients. This guideline describes the mIBG scintigraphy protocol currently used in the clinical routine, but does not include all existing procedures for neuroendocrine tumours. It should therefore not be taken as exclusive of other nuclear medicine modalities that can be used to obtain comparable ...
Lecture 3 - IQ scatter and contrast agents 2013
... • Alternatively, may use a moving grid to blur out the grid lines during exposure – Movement must start before exposure – Must be fast for blurring to occur on shortest exposure times ...
... • Alternatively, may use a moving grid to blur out the grid lines during exposure – Movement must start before exposure – Must be fast for blurring to occur on shortest exposure times ...
ACR-SPR Practice Parameter for Performing FDG
... 4. Attempting to localize the site of primary tumor when metastatic disease is the initial manifestation of malignancy 5. Verifying and localizing “occult” disease, especially in the presence of clinical indicators such as elevated tumor markers 6. Evaluating an abnormality considered “indeterminate ...
... 4. Attempting to localize the site of primary tumor when metastatic disease is the initial manifestation of malignancy 5. Verifying and localizing “occult” disease, especially in the presence of clinical indicators such as elevated tumor markers 6. Evaluating an abnormality considered “indeterminate ...
279-285 Nurdan Simsek Veske.indd
... Place of vibration response imaging in preoperative lung cancer patients Introduction: In this study, we aimed to investigate the role of the vibration response imaging (VRI) as the second-line test in preoperative evaluation of the patients with non-small cell lung cancer (NSCLC) and in prediction ...
... Place of vibration response imaging in preoperative lung cancer patients Introduction: In this study, we aimed to investigate the role of the vibration response imaging (VRI) as the second-line test in preoperative evaluation of the patients with non-small cell lung cancer (NSCLC) and in prediction ...
Novalis Tx™ image-guided radiosurgery linear accelerator
... 1.7 Penumbra: The distance between the 20% and 80% isodose lines for a 10 x 10 cm2 field, measured at a depth of 10 cm with a 100 cm target-skin distance (TSD) along the major axes, measures less than or equal to 9 mm. 1.8 Field Size: The field size is continuously variable from 0.5 x 0.5 cm2 to 40 ...
... 1.7 Penumbra: The distance between the 20% and 80% isodose lines for a 10 x 10 cm2 field, measured at a depth of 10 cm with a 100 cm target-skin distance (TSD) along the major axes, measures less than or equal to 9 mm. 1.8 Field Size: The field size is continuously variable from 0.5 x 0.5 cm2 to 40 ...
AAPM-RSNA Physics Tutorial for Residents: Typical Patient
... this improved contrast comes at the cost of increased patient dose. A grid also absorbs a portion of the primary x rays—that is, those that would have contributed to exposing the image receptor—and the only way to achieve the degree of exposure required to produce the image is to increase the amount ...
... this improved contrast comes at the cost of increased patient dose. A grid also absorbs a portion of the primary x rays—that is, those that would have contributed to exposing the image receptor—and the only way to achieve the degree of exposure required to produce the image is to increase the amount ...
- Surrey Research Insight Open Access
... MR- versus MRCT-TB volumes were more concordant than CT- versus MRCT-TB volumes reflecting MRI’s greater soft-tissue contrast. Nonetheless, there was discordance due to MRI failing to identify some clips, especially those closest to the chest wall. T1-weighted sequences without fat suppression were ...
... MR- versus MRCT-TB volumes were more concordant than CT- versus MRCT-TB volumes reflecting MRI’s greater soft-tissue contrast. Nonetheless, there was discordance due to MRI failing to identify some clips, especially those closest to the chest wall. T1-weighted sequences without fat suppression were ...
Assessment of Myocardial Viability: A Review of Current Non
... Coronary artery disease (CAD) is the most prevalent and single most common cause of morbidity and mortality1 with the resulting left ventricular dysfunction (LVD) an important complication2. Worldwide, CAD accounts for 5.7 million new cases per year, of these 1.3 million in Europe alone3. In additio ...
... Coronary artery disease (CAD) is the most prevalent and single most common cause of morbidity and mortality1 with the resulting left ventricular dysfunction (LVD) an important complication2. Worldwide, CAD accounts for 5.7 million new cases per year, of these 1.3 million in Europe alone3. In additio ...
Noninvasive Diagnosis of Coronary Artery Disease
... associated with a worse prognosis (6 – 8). Angiographic studies have shown that patients with diabetes have more advanced CAD at the time of the diagnosis. Although coronary angiography remains the gold standard, the expense and risk associated with this procedure prohibit its routine use for diagno ...
... associated with a worse prognosis (6 – 8). Angiographic studies have shown that patients with diabetes have more advanced CAD at the time of the diagnosis. Although coronary angiography remains the gold standard, the expense and risk associated with this procedure prohibit its routine use for diagno ...
CMJ The effect of end-systolic volume on ejection fraction in gated
... patients (37 male, 50 female, mean of age: 59 ± 12; 57 ± 11 years) who have visually and quantitatively normal MPS were included to the study. One day stress Tc99m-MIBI gated SPECT protocol was performed. A commercial software (QGS) was used for calculations. Patients were divided into two groups ac ...
... patients (37 male, 50 female, mean of age: 59 ± 12; 57 ± 11 years) who have visually and quantitatively normal MPS were included to the study. One day stress Tc99m-MIBI gated SPECT protocol was performed. A commercial software (QGS) was used for calculations. Patients were divided into two groups ac ...
Primary Aldosteronism - American College of Surgeons
... Clinic in Rochester, Minnesota. The clinical protocol was approved by our IRB. The database had been prospectively collected but was then retrospectively reviewed for purposes of this study. Criteria used to establish a biochemical diagnosis of PA in a patient with hypertension included a PAC of gre ...
... Clinic in Rochester, Minnesota. The clinical protocol was approved by our IRB. The database had been prospectively collected but was then retrospectively reviewed for purposes of this study. Criteria used to establish a biochemical diagnosis of PA in a patient with hypertension included a PAC of gre ...
Do Community Hospitals Need Dual-Energy CT?
... Because the scan data are taken from different energy spectra, DECT can distinguish between materials of different atomic number. Although the limited adoption and availability of dual-energy CT have restricted clinical experience, peer-reviewed publications indicate increased confidence in specific ...
... Because the scan data are taken from different energy spectra, DECT can distinguish between materials of different atomic number. Although the limited adoption and availability of dual-energy CT have restricted clinical experience, peer-reviewed publications indicate increased confidence in specific ...
Consumer Guide to Imaging Modalities
... Radiography is used to image all parts of the body, but chest imaging is most frequent. Over 150 million chest x-rays are performed annually in the U.S., at a cost of over 11 billion dollars per year.18 These images are typically produced from a posteroanterior (PA) view, with the x-ray beam enterin ...
... Radiography is used to image all parts of the body, but chest imaging is most frequent. Over 150 million chest x-rays are performed annually in the U.S., at a cost of over 11 billion dollars per year.18 These images are typically produced from a posteroanterior (PA) view, with the x-ray beam enterin ...
Medical Physics Alumni Newsletter - GSBS Home
... The past year has been a good one for the Graduate Programs in Medical Physics of The University of Texas Graduate School of Biomedical Sciences at Houston. However, it drew to a close with the sad news of the death of Dr. Robert Shalek, whose numerous and profound contributions to the science and p ...
... The past year has been a good one for the Graduate Programs in Medical Physics of The University of Texas Graduate School of Biomedical Sciences at Houston. However, it drew to a close with the sad news of the death of Dr. Robert Shalek, whose numerous and profound contributions to the science and p ...
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.