06. Radiation Protection of Children During Computed Tomography
... Without a reduction in tube current (mA) this leads to a significantly higher dose. 100 kVp or 80 kVp is usually adequate for children. Lowering of kVp enhances contrast 10 kg patient transmits 3-4% while an adult transmits less than 0.1%. Be aware that images with high noise, even if they do not lo ...
... Without a reduction in tube current (mA) this leads to a significantly higher dose. 100 kVp or 80 kVp is usually adequate for children. Lowering of kVp enhances contrast 10 kg patient transmits 3-4% while an adult transmits less than 0.1%. Be aware that images with high noise, even if they do not lo ...
Guidelines for 18 F-FDG PET and PET-CT imaging in
... to be used within the next few years. These guidelines try to reflect this transition phase by providing some recommendations specific for stand-alone PET, but also addressing relevant issues specific to PET-CT imaging. It is envisaged that, if—as it seems—PET/CT scanners become more and more establ ...
... to be used within the next few years. These guidelines try to reflect this transition phase by providing some recommendations specific for stand-alone PET, but also addressing relevant issues specific to PET-CT imaging. It is envisaged that, if—as it seems—PET/CT scanners become more and more establ ...
Understanding Radiation Units - Radiation Protection of Patients
... should become familiar with the following: • Why is it important to measure radiation dose in children? • How radiation dose can and should be expressed? • Understand the radiation quantities and units used in diagnostic radiology. ...
... should become familiar with the following: • Why is it important to measure radiation dose in children? • How radiation dose can and should be expressed? • Understand the radiation quantities and units used in diagnostic radiology. ...
A novel EPID design for enhanced contrast and detective quantum
... inside the imager cassette of the Varian AS-1200. The prototype utilizes the AS-1200 AMFPI as a light converter (photodiode array) and the standard imaging interface of the TrueBeam linear accelerator (LINAC) platform for image acquisition. This allows for direct comparison of the MLI to the LINAC-m ...
... inside the imager cassette of the Varian AS-1200. The prototype utilizes the AS-1200 AMFPI as a light converter (photodiode array) and the standard imaging interface of the TrueBeam linear accelerator (LINAC) platform for image acquisition. This allows for direct comparison of the MLI to the LINAC-m ...
General Radiography - Santa Rosa Junior College
... The purpose of this class is to gain further clinical experience. I will complete _____ madatory competencies and _____ elective competencies during my ________day/week rotation at the assigned clinical site that is affiliated with SRJC. I agree to adhere to the attendance requirements of ______ hou ...
... The purpose of this class is to gain further clinical experience. I will complete _____ madatory competencies and _____ elective competencies during my ________day/week rotation at the assigned clinical site that is affiliated with SRJC. I agree to adhere to the attendance requirements of ______ hou ...
DIAGNOSTIC IMAGING 1 – 1/08/08 Osteopenia: Low Bone Density
... Ex.—There at times when we have determined that additional views are necessary to complete a diagnostic series. A cervical spine series may have more than two views (ex. – 3 view cervical spine series). Ex. – PA Chest – If something is found…We can then take additional views after that. We would sti ...
... Ex.—There at times when we have determined that additional views are necessary to complete a diagnostic series. A cervical spine series may have more than two views (ex. – 3 view cervical spine series). Ex. – PA Chest – If something is found…We can then take additional views after that. We would sti ...
a comparison of fixed and mobile ct and mri scanners
... and considers other implications such as cost and safety. CT and MRI are both diagnostic imaging modalities which produce slice images of various anatomical structures. The theory behind each is very different. CT uses x-rays while MRI takes advantage of the magnetic properties of ions in the human ...
... and considers other implications such as cost and safety. CT and MRI are both diagnostic imaging modalities which produce slice images of various anatomical structures. The theory behind each is very different. CT uses x-rays while MRI takes advantage of the magnetic properties of ions in the human ...
Radiation dose reduction in computed tomography
... the average lifetime attributable risk of incidence and mortality for all cancers from an exposure of 10 mSv is approximately 0.1 and 0.05%, respec‑ tively [6] . Such an estimated risk is much lower than the incidence and mortality rate of naturally occurring cancers, which are approximately 42 and ...
... the average lifetime attributable risk of incidence and mortality for all cancers from an exposure of 10 mSv is approximately 0.1 and 0.05%, respec‑ tively [6] . Such an estimated risk is much lower than the incidence and mortality rate of naturally occurring cancers, which are approximately 42 and ...
Powerpoint 5.3M - University of Surrey
... Finally … the gel dosimetry community is currently very small. Less than 50 people made the trip to Brisbane for ...
... Finally … the gel dosimetry community is currently very small. Less than 50 people made the trip to Brisbane for ...
Acceptance Testing and Quality Control of Dental Imaging
... radiography in general, can be found in references 1–3. There is approximately a factor of two difference in the speed, or sensitivity, of D-speed compared with E-, E/F-, or F-speed films; as a result, the E-, E/F-, or F-speed film requires only approximately half of the radiation of the D-speed fil ...
... radiography in general, can be found in references 1–3. There is approximately a factor of two difference in the speed, or sensitivity, of D-speed compared with E-, E/F-, or F-speed films; as a result, the E-, E/F-, or F-speed film requires only approximately half of the radiation of the D-speed fil ...
Self-Referral CT Screening Application Guide (PDF: 420KB/34pages)
... application must have sufficient detail for MDH to determine that your equipment, facilities, training and experience, and radiation safety program is adequate to protect the health and safety of the public as well as your employees. Please note that CT self-referral screening applications are avail ...
... application must have sufficient detail for MDH to determine that your equipment, facilities, training and experience, and radiation safety program is adequate to protect the health and safety of the public as well as your employees. Please note that CT self-referral screening applications are avail ...
6 The Simulation Process in the Determination and Definition of the
... with radiotherapy needs in mind. Radiotherapy needs have begun to drive product development. This change in manufacturer approach towards radiotherapy has resulted in a variety of imaging options available to radiation oncology departments and it has improved our ability to image patients for treatm ...
... with radiotherapy needs in mind. Radiotherapy needs have begun to drive product development. This change in manufacturer approach towards radiotherapy has resulted in a variety of imaging options available to radiation oncology departments and it has improved our ability to image patients for treatm ...
Radiographic examination of the temporomandibular joint using
... CBCT is a new technique producing reconstructed images of high diagnostic quality using lower radiation doses than normal CT. According to the manufacturer, owing to the use of the cone-shaped X-ray beam and the “smart beam technology”, the absorbed dose from a CBCT scan is approximately equivalent ...
... CBCT is a new technique producing reconstructed images of high diagnostic quality using lower radiation doses than normal CT. According to the manufacturer, owing to the use of the cone-shaped X-ray beam and the “smart beam technology”, the absorbed dose from a CBCT scan is approximately equivalent ...
Adjusting kV to Improve Image Quality or Reduce Radiation Dose
... • Require modified window-level settings, based on radiologist preference ...
... • Require modified window-level settings, based on radiologist preference ...
Extended parallel backprojection for standard three
... per rotation and 672 channels per slice were simulated. Phantom definitions were taken from the phantom data base at http://www.imp.uni-erlangen.de/forbild except for the cardiac motion phantom that is defined in Ref. 30. For simulation, a 2⫻2 subsampling was used for the focal spot for the detector ...
... per rotation and 672 channels per slice were simulated. Phantom definitions were taken from the phantom data base at http://www.imp.uni-erlangen.de/forbild except for the cardiac motion phantom that is defined in Ref. 30. For simulation, a 2⫻2 subsampling was used for the focal spot for the detector ...
Understanding image quality and radiation dose in MSCT and
... exposure to obtain a pair of values Var(Smed) and E(Smed). Now, use the relation Var(Nmed) = E(Nmed) with Var(Smed) = k2 ⋅ Var(Nmed) and E(Smed) = k ⋅ E(Nmed) to find k = Var(Smed) / E(Smed). – Electronic noise: Determine Var(Smin) from the subtraction of two dark images. ...
... exposure to obtain a pair of values Var(Smed) and E(Smed). Now, use the relation Var(Nmed) = E(Nmed) with Var(Smed) = k2 ⋅ Var(Nmed) and E(Smed) = k ⋅ E(Nmed) to find k = Var(Smed) / E(Smed). – Electronic noise: Determine Var(Smin) from the subtraction of two dark images. ...
Tradeoffs in CT Image Quality and Radiation Dose
... influenced by many technical parameters. While image quality has always been a concern for the physics community, clinically acceptable image quality has become even more of an issue as strategies to reduce radiation dose – especially to pediatric patients– become a larger focus. ...
... influenced by many technical parameters. While image quality has always been a concern for the physics community, clinically acceptable image quality has become even more of an issue as strategies to reduce radiation dose – especially to pediatric patients– become a larger focus. ...
- Wiley Online Library
... dose to organs at risk (OARs). Image-guided radiation therapy (IGRT), wherein imaging devices are used to ensure that the radiation delivery adheres as closely as possible to the original plan, can help to minimize these problems. Additionally, IGSPSs employ various methods to achieve accurate targe ...
... dose to organs at risk (OARs). Image-guided radiation therapy (IGRT), wherein imaging devices are used to ensure that the radiation delivery adheres as closely as possible to the original plan, can help to minimize these problems. Additionally, IGSPSs employ various methods to achieve accurate targe ...
cassettes - El Camino College
... build-up on the screen, minimizing the accumulation of screen dirt and helping to prevent artifacts on the film from either screen dirt or static. When cleaning screens with a liquid cleaner, use a soft, lint-free applicator. Pressed cotton squares or nonwoven gauze sponges work well. Never pour liq ...
... build-up on the screen, minimizing the accumulation of screen dirt and helping to prevent artifacts on the film from either screen dirt or static. When cleaning screens with a liquid cleaner, use a soft, lint-free applicator. Pressed cotton squares or nonwoven gauze sponges work well. Never pour liq ...
cassettes - El Camino College
... build-up on the screen, minimizing the accumulation of screen dirt and helping to prevent artifacts on the film from either screen dirt or static. When cleaning screens with a liquid cleaner, use a soft, lint-free applicator. Pressed cotton squares or non-woven gauze sponges work well. Never pour li ...
... build-up on the screen, minimizing the accumulation of screen dirt and helping to prevent artifacts on the film from either screen dirt or static. When cleaning screens with a liquid cleaner, use a soft, lint-free applicator. Pressed cotton squares or non-woven gauze sponges work well. Never pour li ...
The Radiation Protection Implications of the Use of Cone Beam
... The wide range of available types and capabilities of CBCT equipment means that selecting the right model for the dentist’s needs is a more complex exercise than when purchasing other types of dental x-ray equipment. However, CBCT machines can be broadly characterised by the field of view (FOV) prov ...
... The wide range of available types and capabilities of CBCT equipment means that selecting the right model for the dentist’s needs is a more complex exercise than when purchasing other types of dental x-ray equipment. However, CBCT machines can be broadly characterised by the field of view (FOV) prov ...
Copyright Information of the Article Published Online TITLE
... which has the highest worldwide incidence of CF[1]. During the 15-year study period, there was a 5.9 fold increase in all CT imaging[3,25] with an associated increase in CED among hospitalised CF patients[26,27]. In fact, the annual CED from medical imaging has been steadily increasing over the last ...
... which has the highest worldwide incidence of CF[1]. During the 15-year study period, there was a 5.9 fold increase in all CT imaging[3,25] with an associated increase in CED among hospitalised CF patients[26,27]. In fact, the annual CED from medical imaging has been steadily increasing over the last ...
Trends in radiation protection of positron emission tomography
... CT scanners used in PET/CT imaging system are identical to any standard diagnostic CT scanner (modern multi-slice CT). These CT scanners are used to produce scans specifically for AC of the PET data. CT-based AC (CTAC) scans are usually lower-dose scanning parameters. The CTAC scans must not be used ...
... CT scanners used in PET/CT imaging system are identical to any standard diagnostic CT scanner (modern multi-slice CT). These CT scanners are used to produce scans specifically for AC of the PET data. CT-based AC (CTAC) scans are usually lower-dose scanning parameters. The CTAC scans must not be used ...
4 Excitation Processes
... energies of any emitted reaction products have a characteristic value which depends primarily on the atomic number of the target atom. Measuring this provides the basic analytical information in a wide range of analysis methods. Perhaps the simplest methods in concept are those in which the characte ...
... energies of any emitted reaction products have a characteristic value which depends primarily on the atomic number of the target atom. Measuring this provides the basic analytical information in a wide range of analysis methods. Perhaps the simplest methods in concept are those in which the characte ...
handbook - Challenge TB
... The clinical applications of X-ray began almost immediately following the discovery of Xrays by Wilhelm Conrad Roentgen in 1895. Since then, diagnostic X-ray equipment has developed considerably and the imaging quality of X-ray examination has been greatly improved and the methods have been widely d ...
... The clinical applications of X-ray began almost immediately following the discovery of Xrays by Wilhelm Conrad Roentgen in 1895. Since then, diagnostic X-ray equipment has developed considerably and the imaging quality of X-ray examination has been greatly improved and the methods have been widely d ...
Backscatter X-ray
Backscatter X-ray is an advanced X-ray imaging technology. Traditional X-ray machines detect hard and soft materials by the variation in transmission through the target. In contrast, backscatter X-ray detects the radiation that reflects from the target. It has potential applications where less-destructive examination is required, and can be used if only one side of the target is available for examination.The technology is one of two types of whole body imaging technologies that have been used to perform full-body scans of airline passengers to detect hidden weapons, tools, liquids, narcotics, currency, and other contraband. A competing technology is millimeter wave scanner. An airport security machine of this type is also referred to as ""body scanner"", ""whole body imager (WBI)"", ""security scanner"", and ""naked scanner"".