Surface radiation balance in Antarctica as measured with automatic
... for this idea is that changes in a due to snow metamorphism are small on a subdaily timescale. An additional advantage of this method is that riming/icing events can be easily detected and corrected by prescribing lower and upper bounds for aacc (in this paper we used 0.75 and 0.95, respectively). A ...
... for this idea is that changes in a due to snow metamorphism are small on a subdaily timescale. An additional advantage of this method is that riming/icing events can be easily detected and corrected by prescribing lower and upper bounds for aacc (in this paper we used 0.75 and 0.95, respectively). A ...
10. Organization of a Paediatric Radiology Department - RPOP
... 2. Radiology staff should support paediatric patients during radiological examinations. 3. Same shielding devices can be used for male and female patients of all ages. 4. Parent do not need to use personal protective devices when supporting child. ...
... 2. Radiology staff should support paediatric patients during radiological examinations. 3. Same shielding devices can be used for male and female patients of all ages. 4. Parent do not need to use personal protective devices when supporting child. ...
ICRP PUBLICATION 121: Radiological Protection in Paediatric
... not sufficiently efficacious, is contrary to good medical practice and not sound radiological protection. Justification is also a key principle in medical exposures. Publication 105 describes three levels of justification, one of which is justification of individual exposures. This is particularly importan ...
... not sufficiently efficacious, is contrary to good medical practice and not sound radiological protection. Justification is also a key principle in medical exposures. Publication 105 describes three levels of justification, one of which is justification of individual exposures. This is particularly importan ...
Radiological protection for medical exposure to ionizing radiation
... lower health care levels being 1.3 mSv and 0.02 mSv, respectively [1]. 1.3. It should, however, be noted that doses from therapeutic uses of radiation are not included in these averages, as they involve very high doses (in the region of 20–60 Gy) precisely delivered to target volumes in order to era ...
... lower health care levels being 1.3 mSv and 0.02 mSv, respectively [1]. 1.3. It should, however, be noted that doses from therapeutic uses of radiation are not included in these averages, as they involve very high doses (in the region of 20–60 Gy) precisely delivered to target volumes in order to era ...
ICRP Publication 105
... A.1. Pregnancy and medical radiation (Publication 84)........................................... A.2. Interventional procedures (fluoroscopically guided) (Publication 85).............. A.3. Accidental exposures in radiation therapy (Publication 86)............................. A.4. Computed tomograp ...
... A.1. Pregnancy and medical radiation (Publication 84)........................................... A.2. Interventional procedures (fluoroscopically guided) (Publication 85).............. A.3. Accidental exposures in radiation therapy (Publication 86)............................. A.4. Computed tomograp ...
Kit for the Preparation of Technetium Tc99m Sulfur Colloid Injection
... over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of ...
... over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of ...
Welcome to Advances in Molecular Breast
... MBI was not included in his study, but Mayo’s screening trial involved procedures that exposed subjects to 20 mCi of radioisotope, a quantity that O’Connor said translates into an effective dose of 6.5 mSv. Andrew Karellas, PhD, a professor of radiology at the University of Massachusetts Medical Sch ...
... MBI was not included in his study, but Mayo’s screening trial involved procedures that exposed subjects to 20 mCi of radioisotope, a quantity that O’Connor said translates into an effective dose of 6.5 mSv. Andrew Karellas, PhD, a professor of radiology at the University of Massachusetts Medical Sch ...
Ultra-Fast Digital Tomosynthesis Reconstruction Using General
... the wealth of information that can be obtained from threedimensional (3D) CBCT images obtained immediately prior to treatment, including anatomic information for setup (20-24), and CT numbers for dose calculation (25-29) and on-line/off-line re-optimization of plans (5-16). All in all, there is mini ...
... the wealth of information that can be obtained from threedimensional (3D) CBCT images obtained immediately prior to treatment, including anatomic information for setup (20-24), and CT numbers for dose calculation (25-29) and on-line/off-line re-optimization of plans (5-16). All in all, there is mini ...
The Radiation Protection Implications of the Use of Cone Beam
... their use is growing, there is currently little guidance available for dentists to inform them of the different radiation protection requirements for this type of radiography equipment. Suitable guidance is urgently needed to ensure that appropriate radiation safety measures are in place for the pro ...
... their use is growing, there is currently little guidance available for dentists to inform them of the different radiation protection requirements for this type of radiography equipment. Suitable guidance is urgently needed to ensure that appropriate radiation safety measures are in place for the pro ...
Acceptance Testing and Quality Control of Dental Imaging
... It is important to properly perform tests for image quality and safety purposes right after the installation and during routine operation of a dental x-ray unit. Having a quality control (QC) program for dental x-ray facilities is instrumental in ensuring that patients are not receiving excessive ra ...
... It is important to properly perform tests for image quality and safety purposes right after the installation and during routine operation of a dental x-ray unit. Having a quality control (QC) program for dental x-ray facilities is instrumental in ensuring that patients are not receiving excessive ra ...
Chapter 5 Treatment Machines for External Beam - Phy428-528
... During the past two decades most developments in radiation medicine were related to: • Integration of computers in imaging • Development of digital imaging techniques • Incorporation of computers into therapeutic dose delivery with ...
... During the past two decades most developments in radiation medicine were related to: • Integration of computers in imaging • Development of digital imaging techniques • Incorporation of computers into therapeutic dose delivery with ...
Effective dose range for dental cone beam computed tomography
... released on a continuous basis. These devices exhibit a wide variability in terms of crucial exposure parameters such as the X-ray spectrum (voltage peak and filtration), X-ray exposure (mA and number of projections) and volume of the exposed field. Also, many devices allow a degree of versatility reg ...
... released on a continuous basis. These devices exhibit a wide variability in terms of crucial exposure parameters such as the X-ray spectrum (voltage peak and filtration), X-ray exposure (mA and number of projections) and volume of the exposed field. Also, many devices allow a degree of versatility reg ...
CARDIAC CATHETERIZATION EQUIPMENT PERFORMANCE AAPM REPORT NO. 70 Report of Task Group #17
... facilities dealing with different clinical imaging issues outside the realm of normal radiology imaging systems, many medical physicists have only limited experience evaluating the performance of this equipment. The patient and scattered radiation doses in these rooms are among the highest delivered ...
... facilities dealing with different clinical imaging issues outside the realm of normal radiology imaging systems, many medical physicists have only limited experience evaluating the performance of this equipment. The patient and scattered radiation doses in these rooms are among the highest delivered ...
Cone beam-computed tomography applications in endodontics: A
... landmarks like inferior alveolar nerve.[28] 5. To identify resorptional defections such as interior root resorption, exterior surface resorption, inflammation, cervical, or ankylosis cases with these imaging methods.[3] It facilitates right treatment plan and prognosis.[29] 6. CBCT can be used for t ...
... landmarks like inferior alveolar nerve.[28] 5. To identify resorptional defections such as interior root resorption, exterior surface resorption, inflammation, cervical, or ankylosis cases with these imaging methods.[3] It facilitates right treatment plan and prognosis.[29] 6. CBCT can be used for t ...
Radiation therapy
Radiation therapy or radiotherapy, often abbreviated RT, RTx, or XRT, is therapy using ionizing radiation, generally as part of cancer treatment to control or kill malignant cells. Radiation therapy may be curative in a number of types of cancer if they are localized to one area of the body. It may also be used as part of adjuvant therapy, to prevent tumor recurrence after surgery to remove a primary malignant tumor (for example, early stages of breast cancer). Radiation therapy is synergistic with chemotherapy, and has been used before, during, and after chemotherapy in susceptible cancers. The subspecialty of oncology that focuses on radiotherapy is called radiation oncology.Radiation therapy is commonly applied to the cancerous tumor because of its ability to control cell growth. Ionizing radiation works by damaging the DNA of cancerous tissue leading to cellular death. To spare normal tissues (such as skin or organs which radiation must pass through to treat the tumor), shaped radiation beams are aimed from several angles of exposure to intersect at the tumor, providing a much larger absorbed dose there than in the surrounding, healthy tissue. Besides the tumour itself, the radiation fields may also include the draining lymph nodes if they are clinically or radiologically involved with tumor, or if there is thought to be a risk of subclinical malignant spread. It is necessary to include a margin of normal tissue around the tumor to allow for uncertainties in daily set-up and internal tumor motion. These uncertainties can be caused by internal movement (for example, respiration and bladder filling) and movement of external skin marks relative to the tumor position.Radiation oncology is the medical specialty concerned with prescribing radiation, and is distinct from radiology, the use of radiation in medical imaging and diagnosis. Radiation may be prescribed by a radiation oncologist with intent to cure (""curative"") or for adjuvant therapy. It may also be used as palliative treatment (where cure is not possible and the aim is for local disease control or symptomatic relief) or as therapeutic treatment (where the therapy has survival benefit and it can be curative). It is also common to combine radiation therapy with surgery, chemotherapy, hormone therapy, immunotherapy or some mixture of the four. Most common cancer types can be treated with radiation therapy in some way.The precise treatment intent (curative, adjuvant, neoadjuvant, therapeutic, or palliative) will depend on the tumor type, location, and stage, as well as the general health of the patient. Total body irradiation (TBI) is a radiation therapy technique used to prepare the body to receive a bone marrow transplant. Brachytherapy, in which a radiation source is placed inside or next to the area requiring treatment, is another form of radiation therapy that minimizes exposure to healthy tissue during procedures to treat cancers of the breast, prostate and other organs.Radiation therapy has several applications in non-malignant conditions, such as the treatment of trigeminal neuralgia, acoustic neuromas, severe thyroid eye disease, pterygium, pigmented villonodular synovitis, and prevention of keloid scar growth, vascular restenosis, and heterotopic ossification. The use of radiation therapy in non-malignant conditions is limited partly by worries about the risk of radiation-induced cancers.