X-Rays on Earth and From Space NuSTAR Educator`s Guide
... You probably know from visits to the doctor or dentist that X-rays can be used to create images of our insides. These images are not like normal photographs, however. They are really shadows. X-rays can penetrate many materials, but their penetrability depends on the density of the material. Thus, t ...
... You probably know from visits to the doctor or dentist that X-rays can be used to create images of our insides. These images are not like normal photographs, however. They are really shadows. X-rays can penetrate many materials, but their penetrability depends on the density of the material. Thus, t ...
Clinical applications of basic x
... to determine the appropriate selection of technique factors and equipment design for a particular clinical examination. The appearance of a radiograph is described by various image quality elements, which include image density, contrast, blur, and noise. These factors describe various characteristic ...
... to determine the appropriate selection of technique factors and equipment design for a particular clinical examination. The appearance of a radiograph is described by various image quality elements, which include image density, contrast, blur, and noise. These factors describe various characteristic ...
Magnetic Resonance Imaging - Teaching with Technology Yolunda
... conditions Discovers abnormalities, diseases, etc. that other imaging systems might not show Noninvasive alternative ...
... conditions Discovers abnormalities, diseases, etc. that other imaging systems might not show Noninvasive alternative ...
Evolution of CT scanners
... • Patient dose generally increases with better image quality • Diagnosis is the goal of CT • Is patient diagnosis improving with increasing patient dose? • Does greater image quality result in better diagnosis? ...
... • Patient dose generally increases with better image quality • Diagnosis is the goal of CT • Is patient diagnosis improving with increasing patient dose? • Does greater image quality result in better diagnosis? ...
CMPI Exam Format - College of Medical Physics, India
... Paper III – Specialty Paper (Radiation Oncology Physics): This paper is to examine the candidate in that particular specialty. Complete knowledge of the science and practice of the specialty will be required to write this paper. The syllabus for this paper is given in appendix II, in addition the ca ...
... Paper III – Specialty Paper (Radiation Oncology Physics): This paper is to examine the candidate in that particular specialty. Complete knowledge of the science and practice of the specialty will be required to write this paper. The syllabus for this paper is given in appendix II, in addition the ca ...
An Introduction to Fluoroscopy Safety
... the air kerma may overestimate (or underestimate) the actual peak skin dose, one may be uncertain as to the actual dose the patient received. A practical and acceptable response is to notify the patient that he or she may have received a high dose and that you will be examining the skin periodically ...
... the air kerma may overestimate (or underestimate) the actual peak skin dose, one may be uncertain as to the actual dose the patient received. A practical and acceptable response is to notify the patient that he or she may have received a high dose and that you will be examining the skin periodically ...
Proton Therapy Questionnaire This questionnaire requests data
... modulated scanning? If yes, is modulated scanning used for patients on NCI supported clinical trials? If modulated scanning is used, how long does it take to irradiate a 10 cm x 10 cmmm x 10 cm target volume that has a distal depth of 20 cm of water to 1 Gy ...
... modulated scanning? If yes, is modulated scanning used for patients on NCI supported clinical trials? If modulated scanning is used, how long does it take to irradiate a 10 cm x 10 cmmm x 10 cm target volume that has a distal depth of 20 cm of water to 1 Gy ...
Four slice CT scanner comparison report
... expressed as the ratio of the axial imaged slice section thickness relative to the z-axis dose profile. For optimum imaging, the geometric efficiency should be 1, but it is often less, especially for narrow beam collimations where post-patient collimation may be necessary to bring the imaged slice t ...
... expressed as the ratio of the axial imaged slice section thickness relative to the z-axis dose profile. For optimum imaging, the geometric efficiency should be 1, but it is often less, especially for narrow beam collimations where post-patient collimation may be necessary to bring the imaged slice t ...
Chapter 6: The X
... Evaporization deposits on the glass envelope also cause increased filtration of the primary beam and this decreased tube efficiency. (grounded metal envelopes reduce this) Another major cause of tube failure is the breaking of the filament. Filaments become increasingly thin as vaporization (10% su ...
... Evaporization deposits on the glass envelope also cause increased filtration of the primary beam and this decreased tube efficiency. (grounded metal envelopes reduce this) Another major cause of tube failure is the breaking of the filament. Filaments become increasingly thin as vaporization (10% su ...
64E-5
... (9) Control of Scatter Radiation. (a) Fluoroscopic table designs shall be such that scattered radiation which originates beneath the tabletop is attenuated by not less than 0.25 millimeters lead equivalent, and that no unprotected part of any staff or ancillary person’s body shall be exposed to unat ...
... (9) Control of Scatter Radiation. (a) Fluoroscopic table designs shall be such that scattered radiation which originates beneath the tabletop is attenuated by not less than 0.25 millimeters lead equivalent, and that no unprotected part of any staff or ancillary person’s body shall be exposed to unat ...
DIGITAL RADIOLOGY AND PACS
... follows: First, the dependence of the amount of light emission from the imaging plate on the irradiation dose of X-rays shows a good linearity over a wide range of over 1: 104 from a low to a high dose, and a constant optimum density can be attained whenever any quantity of X-ray exposures are being ...
... follows: First, the dependence of the amount of light emission from the imaging plate on the irradiation dose of X-rays shows a good linearity over a wide range of over 1: 104 from a low to a high dose, and a constant optimum density can be attained whenever any quantity of X-ray exposures are being ...
accepted manuscript
... Since the discovery of a new type of radiation by Wilhelm Röntgen, X-rays have been used extensively in various research fields. A pertinent feature of this radiation type is its capability to penetrate material in varying degrees. This is mathematically formulated by Beer’s law, which expresses the ...
... Since the discovery of a new type of radiation by Wilhelm Röntgen, X-rays have been used extensively in various research fields. A pertinent feature of this radiation type is its capability to penetrate material in varying degrees. This is mathematically formulated by Beer’s law, which expresses the ...
Radiation Oncology Error Management
... Wrong site Weekly dose exceeds 30% Total dose exceed 20% Most of the LINACs are inspected and governed by the state government !! ...
... Wrong site Weekly dose exceeds 30% Total dose exceed 20% Most of the LINACs are inspected and governed by the state government !! ...
Dosimetry of 3 CBCT devices for oral and maxillofacial radiology
... the soft tissue contours of the chin and nose were captured at the margins of the field. Phantom levels 2 – 8 were 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 aut ...
... the soft tissue contours of the chin and nose were captured at the margins of the field. Phantom levels 2 – 8 were 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 aut ...
Single Slice CT Scanner Comparison Report
... The GE HiSpeed ZX/i has the same imaging performance as the HiSpeed LX/i and FX/i scanners, but different tube and generator sizes. It also has a shorter minimum scan time and shorter reconstruction time than the FX/i. The Siemens Somatom Emotion is the same as the Balance, with the exception of sca ...
... The GE HiSpeed ZX/i has the same imaging performance as the HiSpeed LX/i and FX/i scanners, but different tube and generator sizes. It also has a shorter minimum scan time and shorter reconstruction time than the FX/i. The Siemens Somatom Emotion is the same as the Balance, with the exception of sca ...
Recent Advances in X-ray Phase Imaging - X
... the atomic number Z, apart from the jumps at absorption edges.1) Therefore, materials consisting of low-Z elements produce poor contrast. Soft tissues in a body and organic materials are difficult to image with X-rays. In order to overcome this difficulty, contrast media or staining is occasionally used ...
... the atomic number Z, apart from the jumps at absorption edges.1) Therefore, materials consisting of low-Z elements produce poor contrast. Soft tissues in a body and organic materials are difficult to image with X-rays. In order to overcome this difficulty, contrast media or staining is occasionally used ...
Inclusion of the dose from kilovoltage cone beam CT in the radiation
... 共Received 18 May 2009; revised 13 November 2009; accepted for publication 15 November 2009; published 10 December 2009兲 Purpose: Cone beam CT is increasingly being used for daily patient positioning verification during radiation therapy treatments. The daily use of CBCT could lead to accumulated pat ...
... 共Received 18 May 2009; revised 13 November 2009; accepted for publication 15 November 2009; published 10 December 2009兲 Purpose: Cone beam CT is increasingly being used for daily patient positioning verification during radiation therapy treatments. The daily use of CBCT could lead to accumulated pat ...
Radiation Protection and Dose Monitoring in Medical
... next section) over 100-150 mSv are associated with a small but statistically significant increase in risk of cancer (42); doses between 50-100 mSv are much debated (the effective dose from a single CT can range from less than 1.0 mSv to more than 30 mSv, although most provide between 2-20 mSv). Whil ...
... next section) over 100-150 mSv are associated with a small but statistically significant increase in risk of cancer (42); doses between 50-100 mSv are much debated (the effective dose from a single CT can range from less than 1.0 mSv to more than 30 mSv, although most provide between 2-20 mSv). Whil ...
PowerPoint - Basics of CT
... Tube (max. values): 100 kW, 140 kV, 800 mA Effective tube current: mAseff = 10 mAs … 1000 mAs Rotation time: Trot = 0.33 … 0.5 s Simultaneously acquired slices: M = 4 … 64 Table increment per rotation: d = 2 … 50 mm Pitch value: p = 0.3 … 1.5 Scan speed: up to 16 cm/s Temporal resolution: 50 … 250 m ...
... Tube (max. values): 100 kW, 140 kV, 800 mA Effective tube current: mAseff = 10 mAs … 1000 mAs Rotation time: Trot = 0.33 … 0.5 s Simultaneously acquired slices: M = 4 … 64 Table increment per rotation: d = 2 … 50 mm Pitch value: p = 0.3 … 1.5 Scan speed: up to 16 cm/s Temporal resolution: 50 … 250 m ...
technical Aspects of a Videofluoroscopic Swallowing Study Aspects
... of eliminating motion blur caused by long acquisition or exposure times (Schueler, 2000). In addition, the pulsed mode can theoretically help to reduce radiation exposure. For example, an equivalent total examination time of 5 seconds would involve 5000 milliseconds of exposure under continuous fluo ...
... of eliminating motion blur caused by long acquisition or exposure times (Schueler, 2000). In addition, the pulsed mode can theoretically help to reduce radiation exposure. For example, an equivalent total examination time of 5 seconds would involve 5000 milliseconds of exposure under continuous fluo ...
Optimizing radiation dose by varying age at pediatric temporal bone
... reduction in image noise by applying iDose at level 3. Using the iDose level 4 at temporal bone CT in adults, Niu et al.(10) achieved a radiation dose reduction of 50% compared to routine protocols with FBP; diagnostic image quality was maintained. As at level 3, iDose decreases the image noise to 0 ...
... reduction in image noise by applying iDose at level 3. Using the iDose level 4 at temporal bone CT in adults, Niu et al.(10) achieved a radiation dose reduction of 50% compared to routine protocols with FBP; diagnostic image quality was maintained. As at level 3, iDose decreases the image noise to 0 ...
Literature - Imageworks Corporation
... The DC system significantly reduces harmful soft radiation, compared to conventional AC type machines. INTRASKAN DC can also be mounted on a mobile stand for safe, quick transport and convenience. ...
... The DC system significantly reduces harmful soft radiation, compared to conventional AC type machines. INTRASKAN DC can also be mounted on a mobile stand for safe, quick transport and convenience. ...
Atlas-based rib-bone detection in chest X-rays
... caused by overlapping anatomical structures, (ii) multiplicative noise and sampling artifacts during acquisition, and (iii) deformation of tissues and anatomical shape variations caused by disease. Rib border contrast is generally poor/low because of the similar intensity values at the rib boundarie ...
... caused by overlapping anatomical structures, (ii) multiplicative noise and sampling artifacts during acquisition, and (iii) deformation of tissues and anatomical shape variations caused by disease. Rib border contrast is generally poor/low because of the similar intensity values at the rib boundarie ...
Clearly The Choice - Raleigh Radiology
... to be abnormal but no lung cancer is found. Abnormal findings may require additional testing to determine whether or not cancer is present. These tests, such as additional CT exams or more invasive tests in which a piece of lung tissue is removed (called a biopsy), have risks and may cause a patient ...
... to be abnormal but no lung cancer is found. Abnormal findings may require additional testing to determine whether or not cancer is present. These tests, such as additional CT exams or more invasive tests in which a piece of lung tissue is removed (called a biopsy), have risks and may cause a patient ...
Notes on “Introduction to biomedical Imaging”
... converted into a single X-ray (with energy kVp). It is characterized by a linear decrease in X-ray intensity with increasing X-ray energy, however many low energy X-rays are absorbed within the tube (additional external filters are used because low energy X-rays would be incapable of passing through ...
... converted into a single X-ray (with energy kVp). It is characterized by a linear decrease in X-ray intensity with increasing X-ray energy, however many low energy X-rays are absorbed within the tube (additional external filters are used because low energy X-rays would be incapable of passing through ...
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"".