Digital chest radiography
... Methods and Materials A retrospective study of digital chest radiography was performed to evaluate the primary x-ray tube collimation of the PA and LAT radiographs. Collimation data from one hundred eighty-six self-reliant female patients between 15 and 55 years of age were included in the study. In ...
... Methods and Materials A retrospective study of digital chest radiography was performed to evaluate the primary x-ray tube collimation of the PA and LAT radiographs. Collimation data from one hundred eighty-six self-reliant female patients between 15 and 55 years of age were included in the study. In ...
X-rays
... • Photon-electron interactions (photoelectric or Compton effects) remove photons from the incident beam. • The number of photons removed depends on the material in which the photon is incident. • Removing photons from the beam produces the radiographic shadows in the detector material. • Compton sca ...
... • Photon-electron interactions (photoelectric or Compton effects) remove photons from the incident beam. • The number of photons removed depends on the material in which the photon is incident. • Removing photons from the beam produces the radiographic shadows in the detector material. • Compton sca ...
Imaging strategies to reduce the risk of radiation in CT studies
... a given medical problem is two, yielding an average total equivalent dose of 40 – 60 mSv (17,19,20). Of particular concern are CT studies involving the liver, pulmonary embolism, and renal calculi. This reflects the high dose per procedure (liver), the territory of coverage (pulmonary embolism), and ...
... a given medical problem is two, yielding an average total equivalent dose of 40 – 60 mSv (17,19,20). Of particular concern are CT studies involving the liver, pulmonary embolism, and renal calculi. This reflects the high dose per procedure (liver), the territory of coverage (pulmonary embolism), and ...
The use of 3D facial imaging and 3D cone beam CT
... location to another. Altitude also plays an important role as people living at higher elevations can receive up to 1500 micro Sv more per year than those living at sea level. The dose from cosmic X-rays during a coast to coast flight in the US is about 30 Micro Sv. Table 1 compares common dental pro ...
... location to another. Altitude also plays an important role as people living at higher elevations can receive up to 1500 micro Sv more per year than those living at sea level. The dose from cosmic X-rays during a coast to coast flight in the US is about 30 Micro Sv. Table 1 compares common dental pro ...
Date approved or revised
... b. exposure switch guidelines 4. Radiation Exposure and Monitoring (9) A. Units of Measurement* 1. absorbed dose 2. dose equivalent 3. exposure B. Dosimeters 1. types 2. proper use C. NCRP Recommendations for Personnel Monitoring (NCRP #116) 1. occupational exposure 2. public exposure 3. embryo/fetu ...
... b. exposure switch guidelines 4. Radiation Exposure and Monitoring (9) A. Units of Measurement* 1. absorbed dose 2. dose equivalent 3. exposure B. Dosimeters 1. types 2. proper use C. NCRP Recommendations for Personnel Monitoring (NCRP #116) 1. occupational exposure 2. public exposure 3. embryo/fetu ...
1 Introduction to medical imaging
... sensitivity to the presence of specific materials such as fat or calcium. As with plain radiography, highdensity objects cause more attenuation of the X-ray beam and are therefore displayed as lighter grey than objects of lower density. White and light grey objects are therefore said to be of ‘high ...
... sensitivity to the presence of specific materials such as fat or calcium. As with plain radiography, highdensity objects cause more attenuation of the X-ray beam and are therefore displayed as lighter grey than objects of lower density. White and light grey objects are therefore said to be of ‘high ...
cosmic and solar radiation: facts for flight attendants
... Through a Solar Particle Event? (And Why To Avoid Them, Especially When Pregnant" (also available online). The following description of these risk estimates is based on materials published by the FAA. Scientists have estimated the health risks by reviewing available health data for people (or cells ...
... Through a Solar Particle Event? (And Why To Avoid Them, Especially When Pregnant" (also available online). The following description of these risk estimates is based on materials published by the FAA. Scientists have estimated the health risks by reviewing available health data for people (or cells ...
Introduction to medical imaging
... radioactive isotopes such as fluorine 18 and oxygen 15. These radioisotopes are incorporated into metabolically relevant compounds [such as 18F-fluorodeoxyglucose (FOG)), which localize in the body after administration. The decay of the isotope produces a positron, which rapidly undergoes a very uni ...
... radioactive isotopes such as fluorine 18 and oxygen 15. These radioisotopes are incorporated into metabolically relevant compounds [such as 18F-fluorodeoxyglucose (FOG)), which localize in the body after administration. The decay of the isotope produces a positron, which rapidly undergoes a very uni ...
CT Dose Summit 2011
... • Is there an opportunity for applicants to submit images at their ‘normal’ protocols at which they interpret even if noisier images than ACR criteria? • The ‘standard’ pediatric noise level is higher than adults but a moving target ...
... • Is there an opportunity for applicants to submit images at their ‘normal’ protocols at which they interpret even if noisier images than ACR criteria? • The ‘standard’ pediatric noise level is higher than adults but a moving target ...
A Closer Look at Pore Geometry
... technology transfer from medical to oilfield applications. We describe how the data can be evaluated using immersive visualization techniques and discuss a range of oilfield applications that may benefit from this technology. Finally, we will see how this technology served researchers in their evalu ...
... technology transfer from medical to oilfield applications. We describe how the data can be evaluated using immersive visualization techniques and discuss a range of oilfield applications that may benefit from this technology. Finally, we will see how this technology served researchers in their evalu ...
PDF Version of this Article
... medial tibial plateau, the lateral tibial plateau, or the central medial femoral condoyle. However, the study revealed a statistically significant (P < 0.05) variation of about 10% in cartilage volume (VC) and cartilage thickness (ThCtAB) in the central lateral femoral condyle. ...
... medial tibial plateau, the lateral tibial plateau, or the central medial femoral condoyle. However, the study revealed a statistically significant (P < 0.05) variation of about 10% in cartilage volume (VC) and cartilage thickness (ThCtAB) in the central lateral femoral condyle. ...
MRIdian™ system for MRI-guided radiotherapy
... specifically investigating this technology may not be forthcoming. This technology is more about doing radiotherapy better rather than doing it more efficiently. For example, it has the potential to really improve the quality of some treatments with its real-time tracking and image capabilities, but ...
... specifically investigating this technology may not be forthcoming. This technology is more about doing radiotherapy better rather than doing it more efficiently. For example, it has the potential to really improve the quality of some treatments with its real-time tracking and image capabilities, but ...
Cross Sectional Medical Imaging: A History
... imaging technology in obstetrics, and echocardiography was acknowledged to be important for detecting abnormal cardiac conditions. In addition, sonognaphy was considered an adjunctive diagnostic technique in the abdomen. But still there were problems. In the first place, scanning times were several ...
... imaging technology in obstetrics, and echocardiography was acknowledged to be important for detecting abnormal cardiac conditions. In addition, sonognaphy was considered an adjunctive diagnostic technique in the abdomen. But still there were problems. In the first place, scanning times were several ...
effective physics education for optimizing ct image quality and dose
... to produce images with characteristics that can be optimized for a wide range of clinical purposes. Also, there is the need to manage the radiation dose for each patient and balance it with respect to the image quality requirements. This is achieved by adjusting the protocol factors for each procedu ...
... to produce images with characteristics that can be optimized for a wide range of clinical purposes. Also, there is the need to manage the radiation dose for each patient and balance it with respect to the image quality requirements. This is achieved by adjusting the protocol factors for each procedu ...
Effects on radiation oncology treatments involving
... such as these also come with a risk in detrimental effects, such as infection, hematomas or seromas in the area where the device is implanted. Repeating surgeries are cost burdening and time inefficient as well. Even to the FDA, these are valid concerns even for relocating the device or minimizing e ...
... such as these also come with a risk in detrimental effects, such as infection, hematomas or seromas in the area where the device is implanted. Repeating surgeries are cost burdening and time inefficient as well. Even to the FDA, these are valid concerns even for relocating the device or minimizing e ...
Reducing Dose While Maintaining Image Quality for Cone Beam Computed... By Peter G. Kroening
... scan of the abdomen has an approximate radiation dose of 15 mSv which is equivalent to 5 years of natural background radiation. There would be low risk for an increase in cancer from this dose. However, if a patient needs multiple scans over the course of their treatment the risk of cancer increases ...
... scan of the abdomen has an approximate radiation dose of 15 mSv which is equivalent to 5 years of natural background radiation. There would be low risk for an increase in cancer from this dose. However, if a patient needs multiple scans over the course of their treatment the risk of cancer increases ...
Trends in Dental Radiography Equipment and Patient Dose in the
... decrease in intra-oral radiography, due in part to X-ray sets operating below 50 kVp becoming obsolete and the significant decrease in the use of speed group D films. The anticipated dose savings from using digital imaging are yet to be fully realised as many practices are either not selecting appro ...
... decrease in intra-oral radiography, due in part to X-ray sets operating below 50 kVp becoming obsolete and the significant decrease in the use of speed group D films. The anticipated dose savings from using digital imaging are yet to be fully realised as many practices are either not selecting appro ...
Pediatric CT: More than Just “Right-sizing” the Dose
... – Informal Poll of Image Gently Steering Committee ...
... – Informal Poll of Image Gently Steering Committee ...
64E-5
... materials placed in the useful beam to produce the maximum output. b. Systems without automatic exposure controls or systems with a manual mode in addition to automatic exposure control modes will have the current and potential set to produce the maximum output. Attenuating material will be placed i ...
... materials placed in the useful beam to produce the maximum output. b. Systems without automatic exposure controls or systems with a manual mode in addition to automatic exposure control modes will have the current and potential set to produce the maximum output. Attenuating material will be placed i ...
Mammography Equipment
... to produce radiation. This allows for longer exposures to achieve a quality image, giving the patient a larger dose of radiation. • Three phase unit: uses a faster 6-pulse current to achieve the same quality image. It uses less time, which gives the patient less radiation dose, and less chance for m ...
... to produce radiation. This allows for longer exposures to achieve a quality image, giving the patient a larger dose of radiation. • Three phase unit: uses a faster 6-pulse current to achieve the same quality image. It uses less time, which gives the patient less radiation dose, and less chance for m ...
Slide 1
... specificity requires examination of phantoms, objects, or crystals with known composition, architecture & structure. Imaging may be limited by the amount of time a subject can be exposed without doing damage by exposing them/it to xray bombardment. Most modern techniques have attempted to minimize e ...
... specificity requires examination of phantoms, objects, or crystals with known composition, architecture & structure. Imaging may be limited by the amount of time a subject can be exposed without doing damage by exposing them/it to xray bombardment. Most modern techniques have attempted to minimize e ...
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"".