1- Regarding the M
... The effective atomic number of the object determines the amount of scatter produced. Scatter is proportional to electron density. An incident photon of high energy will lose more energy than a low energy photon in a Compton interaction with an electron at a given angle. ...
... The effective atomic number of the object determines the amount of scatter produced. Scatter is proportional to electron density. An incident photon of high energy will lose more energy than a low energy photon in a Compton interaction with an electron at a given angle. ...
ENDODONTICS - American Association of Endodontists
... CBCT is accomplished by using a rotating gantry to which an x-ray source and detector are fixed. A divergent pyramidalor cone-shaped source of ionizing radiation is directed through the middle of the area of interest onto an area x-ray detector on the opposite side of the patient. The x-ray source a ...
... CBCT is accomplished by using a rotating gantry to which an x-ray source and detector are fixed. A divergent pyramidalor cone-shaped source of ionizing radiation is directed through the middle of the area of interest onto an area x-ray detector on the opposite side of the patient. The x-ray source a ...
Good Afternoon I am Bulent Aydogan and I will be Good Afternoon I
... locations with a wider variation with respect to the colpostats (80, 81), often with point A falling in a high-gradient region of the isodose distribution. The result of this variation is that two patients with minor differences in the application can receive markedly different amounts of radiation. ...
... locations with a wider variation with respect to the colpostats (80, 81), often with point A falling in a high-gradient region of the isodose distribution. The result of this variation is that two patients with minor differences in the application can receive markedly different amounts of radiation. ...
PET/CT Issues: CT-based attenuation correction (CTAC), Artifacts
... The most important physical effect in PET imaging: • The number of detected photons is significantly reduced compared to the number of source photons in a spatially-dependent manner • For PET it is mainly due to Compton scatter out of the detector ring • For CT it is a combination of Compton scatter ...
... The most important physical effect in PET imaging: • The number of detected photons is significantly reduced compared to the number of source photons in a spatially-dependent manner • For PET it is mainly due to Compton scatter out of the detector ring • For CT it is a combination of Compton scatter ...
Role of 18F-Fluorodeoxyglucose Positron Emission Tomography
... Objectives: We aimed to analyze the contribution of 18 F-fluorodeoxyglucose positron emission tomography/computed tomography (FDG PET/CT) imaging to the diagnosis and management of pancreatic cancer compared with multidetector row computed tomography (MDCT), magnetic resonance imaging (MRI) and endo ...
... Objectives: We aimed to analyze the contribution of 18 F-fluorodeoxyglucose positron emission tomography/computed tomography (FDG PET/CT) imaging to the diagnosis and management of pancreatic cancer compared with multidetector row computed tomography (MDCT), magnetic resonance imaging (MRI) and endo ...
12 Patient Immobilization and Image Guidance
... ii) The GTV is surrounded by a clinical target volume (CTV) which contains local sub-clinical spread. The density of the tumor cells is typically assumed to reduce with distance from the GTV as demonstrated in the case of breast cancer by Holland et al. (1985). Unlike the GTV, the CTV is determined ...
... ii) The GTV is surrounded by a clinical target volume (CTV) which contains local sub-clinical spread. The density of the tumor cells is typically assumed to reduce with distance from the GTV as demonstrated in the case of breast cancer by Holland et al. (1985). Unlike the GTV, the CTV is determined ...
Attenuation correction of myocardial perfusion SPET in patients of
... Soft tissue attenuation artefacts are more likely to occur in patients with high body mass index (BMI) undergoing myocardial perfusion imaging (MPI) and therefore it is routine practice in our department to perform attenuation correction in this group of patients. However, we suspected that attenuat ...
... Soft tissue attenuation artefacts are more likely to occur in patients with high body mass index (BMI) undergoing myocardial perfusion imaging (MPI) and therefore it is routine practice in our department to perform attenuation correction in this group of patients. However, we suspected that attenuat ...
Y-90 SIRT in the Liver - Emory Radiology
... mCi Y-90 Upper limit of activity shunted to the lungs is F x A = 0.61 GBq (16.5 mCi) 0.00 Gy A (GBq) x F x 50 x [1-R], Assume lung mass 1kg, upper limit = 30 Gy Total accumulated Lung dose = 50 Gy mCi Y-90 0.00 mCi Y-90 0.00 Gy ...
... mCi Y-90 Upper limit of activity shunted to the lungs is F x A = 0.61 GBq (16.5 mCi) 0.00 Gy A (GBq) x F x 50 x [1-R], Assume lung mass 1kg, upper limit = 30 Gy Total accumulated Lung dose = 50 Gy mCi Y-90 0.00 mCi Y-90 0.00 Gy ...
The Mini C-arm Adds Quality and Efficiency to the Pediatric
... patients to a lower radiation dose than plain radiographs.2,4 Lee et al3 estimated the radiation dose for each reduction from the number of paper images that the resident printed and saved during the fracture reduction. However, Sumko et al5 found that Lee et al3 and other authors underestimated rad ...
... patients to a lower radiation dose than plain radiographs.2,4 Lee et al3 estimated the radiation dose for each reduction from the number of paper images that the resident printed and saved during the fracture reduction. However, Sumko et al5 found that Lee et al3 and other authors underestimated rad ...
Trends in Dental Radiography Equipment and Patient Dose in the
... 2010). The radiation doses from individual dental radiographs are generally lower than other forms of medical X-ray examinations and consequently dental X-rays are responsible for only 0.4% of the UK collective dose from medical exposures (Hart, Wall, Hillier and Shrimpton, 2010). Dentists, like all ...
... 2010). The radiation doses from individual dental radiographs are generally lower than other forms of medical X-ray examinations and consequently dental X-rays are responsible for only 0.4% of the UK collective dose from medical exposures (Hart, Wall, Hillier and Shrimpton, 2010). Dentists, like all ...
X-ray imaging: Fundamentals and planar imaging - English
... Originally, the radiation was captured by a normal photographic film. In the film, the energetic Xray photons are absorbed in the silver halide (NaB-NaI) crystals, generating very small amounts of free silver. During film processing, any grain with small amounts of free silver are completely convert ...
... Originally, the radiation was captured by a normal photographic film. In the film, the energetic Xray photons are absorbed in the silver halide (NaB-NaI) crystals, generating very small amounts of free silver. During film processing, any grain with small amounts of free silver are completely convert ...
A quality assurance phantom for electronic portal
... radiographs (DRR)(1-3) from a treatment plan are usually compared with portal images either in analog forms (radiographs) or in digital format with an electronic portal imaging device (EPID).(4-6) Changes in EPID technology are providing unsurpassed image quality for patient setup and verification. ...
... radiographs (DRR)(1-3) from a treatment plan are usually compared with portal images either in analog forms (radiographs) or in digital format with an electronic portal imaging device (EPID).(4-6) Changes in EPID technology are providing unsurpassed image quality for patient setup and verification. ...
MYOCARDIAL PERFUSION STUDY
... d) sick sinus syndrome, and 2nd and 3rd degree AV block unless the patient has a functioning cardiac pacemaker. e) hypotension, e.g. resting systolic pressure < 80 mm Hg 4. The patient should be NPO for 4-6 hours prior to the study (adenosine may cause nausea and vomiting). 5. The patient should be ...
... d) sick sinus syndrome, and 2nd and 3rd degree AV block unless the patient has a functioning cardiac pacemaker. e) hypotension, e.g. resting systolic pressure < 80 mm Hg 4. The patient should be NPO for 4-6 hours prior to the study (adenosine may cause nausea and vomiting). 5. The patient should be ...
Performance of Philips Gemini TF PET/CT Scanner
... the scanner were made using the National Electrical Manufacturers Association (NEMA) NU2-2001 procedures to benchmark its conventional imaging capabilities. The scatter fraction and noise equivalent count (NEC) measurements with the NEMA cylinder (20-cm diameter) were repeated for 2 larger cylinders ...
... the scanner were made using the National Electrical Manufacturers Association (NEMA) NU2-2001 procedures to benchmark its conventional imaging capabilities. The scatter fraction and noise equivalent count (NEC) measurements with the NEMA cylinder (20-cm diameter) were repeated for 2 larger cylinders ...
PET CT Scan
... Positron Emission Tomography Scanner with multi-detector (32 slice or more) Spiral CT scanner. A latest technology high resolution whole body Positron Emission Tomography system with integrated 32 slice Spiral CT scanner (PET-CT) designed for providing volume measurements of metabolic and physiologi ...
... Positron Emission Tomography Scanner with multi-detector (32 slice or more) Spiral CT scanner. A latest technology high resolution whole body Positron Emission Tomography system with integrated 32 slice Spiral CT scanner (PET-CT) designed for providing volume measurements of metabolic and physiologi ...
The Role of the Radiographer in Computed Tomography Imaging
... radiographer must have expertise that builds upon pre and post registration education and training to work safely and effectively. In addition to this, radiographers undertake further training and education to Master (MSc) and Doctorate (PhD) level in order to extend their scope of practice to advan ...
... radiographer must have expertise that builds upon pre and post registration education and training to work safely and effectively. In addition to this, radiographers undertake further training and education to Master (MSc) and Doctorate (PhD) level in order to extend their scope of practice to advan ...
Medical Physics Alumni Newsletter - GSBS Home
... of the GSBS, and we are currently preparing our application to the Texas Higher Education Co-ordinating Board. We have received a grant from the MD Anderson Cancer Foundation to help with the expenses of starting up the program, such as developing the curriculum for the clinical phase. The DMP progr ...
... of the GSBS, and we are currently preparing our application to the Texas Higher Education Co-ordinating Board. We have received a grant from the MD Anderson Cancer Foundation to help with the expenses of starting up the program, such as developing the curriculum for the clinical phase. The DMP progr ...
Medical Physics Personnel for Medical Imaging Requirements
... shortage can have a significant impact on patient radiation protection, particularly in medical imaging applications. Given these findings, ASN and the SFPM have decided to issue recommendations to help the medical institutions define their medical physics requirements. This guide entitled « Medical ...
... shortage can have a significant impact on patient radiation protection, particularly in medical imaging applications. Given these findings, ASN and the SFPM have decided to issue recommendations to help the medical institutions define their medical physics requirements. This guide entitled « Medical ...
Nuclear medicine
Nuclear medicine is a medical specialty involving the application of radioactive substances in the diagnosis and treatment of disease. Nuclear medicine scans are usually conducted by radiographers. Nuclear medicine, in a sense, is ""radiology done inside out"" or ""endoradiology"" because it records radiation emitting from within the body rather than radiation that is generated by external sources like X-rays.