01 - Use of a dDVH decomposition technique to evaluate
... for patients with right lung involvement was significantly higher. In our conclusion it are these patients specifically who will receive benefit from an IMRT based treatment while the other patients can be treated conventionally with the same complication probability. Keywords : treatment planning, ...
... for patients with right lung involvement was significantly higher. In our conclusion it are these patients specifically who will receive benefit from an IMRT based treatment while the other patients can be treated conventionally with the same complication probability. Keywords : treatment planning, ...
3 JCI dosimetry for CT
... The [critical access] hospital documents in the patient’s record the radiation dose index (CTDIvol, DLP, or size-specific dose estimate [SSDE]) on every study produced during a diagnostic computed tomography (CT) examination. The radiation dose index must be exam specific, summarized by series o ...
... The [critical access] hospital documents in the patient’s record the radiation dose index (CTDIvol, DLP, or size-specific dose estimate [SSDE]) on every study produced during a diagnostic computed tomography (CT) examination. The radiation dose index must be exam specific, summarized by series o ...
radiation pressure cross section for fluffy aggregates
... Bj"2hc2j~5[exp (hc/jkB¹)!1]~1, where h and kB are the Planck and Boltzmann constants. It is well-known that the Planck function exhibits a maximum at a wavelength j%&& that fulfills the condition j%&&¹"2897.9 lm K. We consider the temperature range of ¹"2000—12000 K, which corresponds to the wavelen ...
... Bj"2hc2j~5[exp (hc/jkB¹)!1]~1, where h and kB are the Planck and Boltzmann constants. It is well-known that the Planck function exhibits a maximum at a wavelength j%&& that fulfills the condition j%&&¹"2897.9 lm K. We consider the temperature range of ¹"2000—12000 K, which corresponds to the wavelen ...
Walter et al. (2007) Radiotherapy and Oncology 85
... that is added to the planned dose by the imaging process, depends on the mode of image acquisition. Electronic portal imaging based on amorphous silicon detectors has significantly improved image quality for MV-imaging, but suffers from the same basic problems as film-based planar MV-imaging, these ...
... that is added to the planned dose by the imaging process, depends on the mode of image acquisition. Electronic portal imaging based on amorphous silicon detectors has significantly improved image quality for MV-imaging, but suffers from the same basic problems as film-based planar MV-imaging, these ...
Imaging doses from the Elekta Synergy X
... The Elekta SynergyTM (Elekta Oncology Systems Ltd., Crawley, UK) is one of a new breed of radiotherapy linear accelerators specifically designed for image guided radiotherapy (IGRT). It has a kilo-voltage X-ray source and opposing amorphous silicon flat panel imager, both mounted at 90˚ to the treat ...
... The Elekta SynergyTM (Elekta Oncology Systems Ltd., Crawley, UK) is one of a new breed of radiotherapy linear accelerators specifically designed for image guided radiotherapy (IGRT). It has a kilo-voltage X-ray source and opposing amorphous silicon flat panel imager, both mounted at 90˚ to the treat ...
6 CCR 1007-1 Part 02 RADIATION CONTROL
... 2.2.1 Definitions of general applicability to these regulations are in Part 1, section 1.2. 2.2.2 As used in Part 2, each term below has the definition set forth. “ARRT” means the American Registry of Radiologic Technologists. “ARRT(R)” . See “radiologic technologist” . “ASRT” means the American Soc ...
... 2.2.1 Definitions of general applicability to these regulations are in Part 1, section 1.2. 2.2.2 As used in Part 2, each term below has the definition set forth. “ARRT” means the American Registry of Radiologic Technologists. “ARRT(R)” . See “radiologic technologist” . “ASRT” means the American Soc ...
General Radiography - Santa Rosa Junior College
... Step 3: Using the following paragraph as a sample to complete the last page of this syllabus: 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 sit ...
... Step 3: Using the following paragraph as a sample to complete the last page of this syllabus: 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 sit ...
Comprehensive TG-142 ImaGInG and machIne Qa
... imagers and machines degrade over time and recalibrations are required. TG-142 reconciles these divergent trends by recommending a multitude of daily, monthly and annual QA procedures. Though aimed at preventing clinically significant errors, these requirements further strain the busy schedules of R ...
... imagers and machines degrade over time and recalibrations are required. TG-142 reconciles these divergent trends by recommending a multitude of daily, monthly and annual QA procedures. Though aimed at preventing clinically significant errors, these requirements further strain the busy schedules of R ...
Radiation Therapy Professional Curriculum
... Advances in radiation therapy have brought forth necessary changes in the education of radiation therapists. A national committee representing a variety of program types from across the country developed the curriculum. Input from The American Registry of Radiologic Technologists (ARRT) and the Join ...
... Advances in radiation therapy have brought forth necessary changes in the education of radiation therapists. A national committee representing a variety of program types from across the country developed the curriculum. Input from The American Registry of Radiologic Technologists (ARRT) and the Join ...
ABDOMINAL EXAMINATION IN KNH USING 16 MULTI-SLICE
... contributed 34% of the collective radiation dose. The range of application for abdominal CT examinations for diagnostic and even therapeutic value cannot be overemphasized. On the other hand, there is clear need to assess ALARA practice in the application of this useful imaging tool especially in th ...
... contributed 34% of the collective radiation dose. The range of application for abdominal CT examinations for diagnostic and even therapeutic value cannot be overemphasized. On the other hand, there is clear need to assess ALARA practice in the application of this useful imaging tool especially in th ...
image gently campaign - Medical Physics International Journal
... was a long-standing commitment to safe and effective imaging in children needed to find a broader audience including patients, parents and other caregivers, our colleagues who cared for children including pediatricians and family practitioners, and the public. This need was partly a result of a grow ...
... was a long-standing commitment to safe and effective imaging in children needed to find a broader audience including patients, parents and other caregivers, our colleagues who cared for children including pediatricians and family practitioners, and the public. This need was partly a result of a grow ...
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 ...
Current concepts on imaging in radiotherapy
... (using optical lasers) and immobilized just as he/she will be during treatment delivery. The patient’s structural information is obtained using computed tomography (CT). The CT images, containing three-dimensional (3D) information of patient anatomy, are then transferred to an RT planning (RTP) syst ...
... (using optical lasers) and immobilized just as he/she will be during treatment delivery. The patient’s structural information is obtained using computed tomography (CT). The CT images, containing three-dimensional (3D) information of patient anatomy, are then transferred to an RT planning (RTP) syst ...
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.