Computed tomography--an increasing source of radiation exposure.
... this subgroup was about 40 mSv, which approximates the relevant organ dose from a typical CT study involving two or three scans in an adult. Although most of the quantitative estimates of the radiation-induced cancer risk are derived from analyses of atomic-bomb survivors, there are other supporting ...
... this subgroup was about 40 mSv, which approximates the relevant organ dose from a typical CT study involving two or three scans in an adult. Although most of the quantitative estimates of the radiation-induced cancer risk are derived from analyses of atomic-bomb survivors, there are other supporting ...
EPSM 2013 Student Abstracts
... INTRODUCTION: The kidneys are a principal dose-limiting organ in radiotherapy for upper abdominal cancers. Our current understanding of kidney dose response and tolerance is limited and this is hindering efforts to introduce advanced radiotherapy techniques for upper-abdominal cancers. More precise ...
... INTRODUCTION: The kidneys are a principal dose-limiting organ in radiotherapy for upper abdominal cancers. Our current understanding of kidney dose response and tolerance is limited and this is hindering efforts to introduce advanced radiotherapy techniques for upper-abdominal cancers. More precise ...
What Parents Should Know about the Safety of
... through without changes but are absorbed differently by various tissues of the body. Once they pass through a body part, they are captured by the film and produce images in tones of gray showing calcified structures such as the jaw bones, teeth, and other bony structures. The use of x-rays to create ...
... through without changes but are absorbed differently by various tissues of the body. Once they pass through a body part, they are captured by the film and produce images in tones of gray showing calcified structures such as the jaw bones, teeth, and other bony structures. The use of x-rays to create ...
Use of Ionising Radiation for Research in Humans
... For ionising radiation procedures deemed to be in addition to standard clinical care: Any exposure to ionising radiation beyond that considered standard clinical care of the condition being treated. Radiation exposure that is requested specifically for research purposes only, for example use of diff ...
... For ionising radiation procedures deemed to be in addition to standard clinical care: Any exposure to ionising radiation beyond that considered standard clinical care of the condition being treated. Radiation exposure that is requested specifically for research purposes only, for example use of diff ...
Canadian Association of Radiologists Radiation Protection Working
... cells. Understanding the models used to predict the effects of radiation are valuable towards understanding the radiation protection principles and dose-optimization strategies. Deterministic effects occur after the absorbed dose exceeds a dose threshold that leads to an observable biologic change, ...
... cells. Understanding the models used to predict the effects of radiation are valuable towards understanding the radiation protection principles and dose-optimization strategies. Deterministic effects occur after the absorbed dose exceeds a dose threshold that leads to an observable biologic change, ...
Radiation - inayacollegedrmohammedemam
... Because Gamma rays can kill living cells, they are used to kill cancer cells without having to resort to difficult surgery. This is called "Radiotherapy", and works because cancer cells can't repair themselves when damaged by gamma rays, as healthy cells can ...
... Because Gamma rays can kill living cells, they are used to kill cancer cells without having to resort to difficult surgery. This is called "Radiotherapy", and works because cancer cells can't repair themselves when damaged by gamma rays, as healthy cells can ...
QUASAR Body Phantom
... support the testing of a wide variety of nondosimetric functions of Radiation Therapy Planning Systems and CT simulators using a single set of test objects. A valuable part of any quality assurance program, the QUASAR phantoms can improve the efficiency of your quality assurance program. The phantom ...
... support the testing of a wide variety of nondosimetric functions of Radiation Therapy Planning Systems and CT simulators using a single set of test objects. A valuable part of any quality assurance program, the QUASAR phantoms can improve the efficiency of your quality assurance program. The phantom ...
cosmic and solar radiation: facts for flight attendants
... assumes normal solar activity. Flying during solar particle events (SPE) will reduce this recommended maximum number of flights dramatically. Incredibly, the ICRP assumes that a mother's belly shields the fetus from 50% of the radiation that the mother is exposed to, even though that same radiation ...
... assumes normal solar activity. Flying during solar particle events (SPE) will reduce this recommended maximum number of flights dramatically. Incredibly, the ICRP assumes that a mother's belly shields the fetus from 50% of the radiation that the mother is exposed to, even though that same radiation ...
9852 MS-Word - Maine Legislature
... 2. Dental radiographer. "Dental radiographer" means a person, other than a licensed practitioner, whose duties include radiography of the maxilla, mandible and adjacent structures for diagnostic purposes and who is licensed under chapter 143. [ 2015, c. 429, §18 (AMD) .] 3. Ionizing radiation. "Ioni ...
... 2. Dental radiographer. "Dental radiographer" means a person, other than a licensed practitioner, whose duties include radiography of the maxilla, mandible and adjacent structures for diagnostic purposes and who is licensed under chapter 143. [ 2015, c. 429, §18 (AMD) .] 3. Ionizing radiation. "Ioni ...
Image-guided Radiation Therapy (IGRT)
... The number and severity of side effects you experience will depend on the type of radiation and dosage you receive and the part of your body being treated. You should talk to your doctor and nurse about any side effects you experience so they can help you manage them. Radiation therapy can cause ear ...
... The number and severity of side effects you experience will depend on the type of radiation and dosage you receive and the part of your body being treated. You should talk to your doctor and nurse about any side effects you experience so they can help you manage them. Radiation therapy can cause ear ...
printable version - Environment, Health and Safety
... I-125) are used in Nuclear Medicine for diagnostic procedures and emit gamma rays, which are a penetrating radiation, like x-rays. These radionuclides remain in the patient after the study is over, but have short half-lives, so the patient and the people around him or her are not exposed for a long ...
... I-125) are used in Nuclear Medicine for diagnostic procedures and emit gamma rays, which are a penetrating radiation, like x-rays. These radionuclides remain in the patient after the study is over, but have short half-lives, so the patient and the people around him or her are not exposed for a long ...
NRG-RTOG 9601 study
... Survival for Men with Recurrent or Persistent Prostate Cancer PHILADELPHIA, PA — NRG Oncology investigators found that daily bicalutamide during and for 24 months after salvage radiation therapy improved long-term survival for men with persistent or recurrent cancer following radical prostatectomy. ...
... Survival for Men with Recurrent or Persistent Prostate Cancer PHILADELPHIA, PA — NRG Oncology investigators found that daily bicalutamide during and for 24 months after salvage radiation therapy improved long-term survival for men with persistent or recurrent cancer following radical prostatectomy. ...
Optimising patient dose The right dose of expertise
... With Qaelum’s tqm|DOSETM platform, Agfa HealthCare offers an advanced solution for patient radiation dose monitoring, analysis and improvement in digital imaging. The vendor-neutral dose management solution integrates into existing PACS environments and collects relevant dose and metadata informatio ...
... With Qaelum’s tqm|DOSETM platform, Agfa HealthCare offers an advanced solution for patient radiation dose monitoring, analysis and improvement in digital imaging. The vendor-neutral dose management solution integrates into existing PACS environments and collects relevant dose and metadata informatio ...
Computed Tomography Routine Examinations and the Related Risk
... abdomen, head, thorax, cervical and pelvis. The IAEA definitions were adopted for the dosimetric quantities expressed in terms of kerma [2]. The weighted air kerma index Cw (see Eq. (1)) has the objective of measuring the air kerma index within the phantoms; the volumetric air kerma index Cvol (Eq. ...
... abdomen, head, thorax, cervical and pelvis. The IAEA definitions were adopted for the dosimetric quantities expressed in terms of kerma [2]. The weighted air kerma index Cw (see Eq. (1)) has the objective of measuring the air kerma index within the phantoms; the volumetric air kerma index Cvol (Eq. ...
What does PACS stand for?
... • B. The photoelectric effect is a photon absorption interaction resulting in an ejected electron. • C. Pair production cannot occur in diagnostic X-ray energies. ...
... • B. The photoelectric effect is a photon absorption interaction resulting in an ejected electron. • C. Pair production cannot occur in diagnostic X-ray energies. ...
Imaging Needs for Protons
... • Imaging serves to ensure the correct fraction dose • … and, in current practice, assumes geometry equals dosimetry. • True for g – Geometry does not affect dosimetry • False for p – Geometry strongly affects dosimetry • Not all observables are image-based • DGRT: Dose-Guided RT ...
... • Imaging serves to ensure the correct fraction dose • … and, in current practice, assumes geometry equals dosimetry. • True for g – Geometry does not affect dosimetry • False for p – Geometry strongly affects dosimetry • Not all observables are image-based • DGRT: Dose-Guided RT ...
Assessment of absorbed dose in critical organs in OPG: a phantom
... US with an estimated 1890 deaths in 2014, with 3 in 4 cases occurring in women. It is the most rapidly increasing cancer in the US and has been increasing worldwide over the past few decades which might be due to increased detection using more sensitive diagnostic procedures. The known risk factors ...
... US with an estimated 1890 deaths in 2014, with 3 in 4 cases occurring in women. It is the most rapidly increasing cancer in the US and has been increasing worldwide over the past few decades which might be due to increased detection using more sensitive diagnostic procedures. The known risk factors ...
External Fire Spread and Building Separation distances
... building separation and boundary distances’ if more precise methods are required. – Similar guidance is given in the Scottish Technical handbooks. – BR187 (1991 & 2014) presents ...
... building separation and boundary distances’ if more precise methods are required. – Similar guidance is given in the Scottish Technical handbooks. – BR187 (1991 & 2014) presents ...
Paediatric Dose and Image quality
... • A study on radiation dose and image quality of low-dose CT scans of the paranasal sinuses with eye lens protection: ...
... • A study on radiation dose and image quality of low-dose CT scans of the paranasal sinuses with eye lens protection: ...
Radiation Safety and Physics
... (kVp) is the other factor that is important in obtaining an x-ray. (A volt is the unit of electrical pressure needed to move one ampere of current through a resistance of one Ohm.) The kVp is the factor that controls the energy of the electrons as they move across the tube during x-ray production an ...
... (kVp) is the other factor that is important in obtaining an x-ray. (A volt is the unit of electrical pressure needed to move one ampere of current through a resistance of one Ohm.) The kVp is the factor that controls the energy of the electrons as they move across the tube during x-ray production an ...
Medical radiation exposure and accidents. Dosimetry and radiation
... are receiving lower doses of radiation. They receive the same amount of radiation as before, or even more. However, significant image noise reduction allows for up to 60% radiation dose reduction in CT routine clinical use. Using iterative reconstruction techniques a decoupling of spatial resolution ...
... are receiving lower doses of radiation. They receive the same amount of radiation as before, or even more. However, significant image noise reduction allows for up to 60% radiation dose reduction in CT routine clinical use. Using iterative reconstruction techniques a decoupling of spatial resolution ...
Lecture 1(4)- Sources in diagnostic Rad. – Computed Tomography
... Patient doses from CT examinations are relatively high (10 -100 mSv). Substantial dose variations for similar examinations can arise from different imaging protocols or between scanner types. ...
... Patient doses from CT examinations are relatively high (10 -100 mSv). Substantial dose variations for similar examinations can arise from different imaging protocols or between scanner types. ...
Radiation Safety in Pediatric Imaging - RPOP
... medico-legal problem Financial incentive system High technology exam wanted by public ...
... medico-legal problem Financial incentive system High technology exam wanted by public ...
Enhancing Patient Safety in Today`s Healthcare
... Tube voltage (kV), or tube potential, relates to the energy of the X-ray beam. In contrast to what occurs with mA, radiation dose varies approximately as the square of tube voltage. As a result, small reductions in kV have a more substantial effect on radiation dose reduction. kV values remain const ...
... Tube voltage (kV), or tube potential, relates to the energy of the X-ray beam. In contrast to what occurs with mA, radiation dose varies approximately as the square of tube voltage. As a result, small reductions in kV have a more substantial effect on radiation dose reduction. kV values remain const ...
Radiation burn
A radiation burn is damage to the skin or other biological tissue caused by exposure to radiation. The radiation types of greatest concern are thermal radiation, radio frequency energy, ultraviolet light and ionizing radiation.The most common type of radiation burn is a sunburn caused by UV radiation. High exposure to X-rays during diagnostic medical imaging or radiotherapy can also result in radiation burns. As the ionizing radiation interacts with cells within the body—damaging them—the body responds to this damage, typically resulting in erythema—that is, redness around the damaged area. Radiation burns are often associated with radiation-induced cancer due to the ability of ionizing radiation to interact with and damage DNA, occasionally inducing a cell to become cancerous. Cavity magnetrons can be improperly used to create surface and internal burning. Depending on the photon energy, gamma radiation can cause very deep gamma burns, with 60Co internal burns are common. Beta burns tend to be shallow as beta particles are not able to penetrate deep into the person; these burns can be similar to sunburn.Radiation burns can also occur with high power radio transmitters at any frequency where the body absorbs radio frequency energy and converts it to heat. The U.S. Federal Communications Commission (FCC) considers 50 watts to be the lowest power above which radio stations must evaluate emission safety. Frequencies considered especially dangerous occur where the human body can become resonant, at 35 MHz, 70 MHz, 80-100 MHz, 400 MHz, and 1 GHz. Exposure to microwaves of too high intensity can cause microwave burns.