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here - IROC Houston
here - IROC Houston

... Image guided radiation therapy (IGRT) for credentialing purposes is defined as external beam radiation therapy with positional verification using imaging prior to each treatment fraction. It is a complete process that extends from the imaging at the time of CT-simulation through imaging the patient ...
Physics Practice Questions 2009
Physics Practice Questions 2009

... Thicker, decreased resolution (have more blur), used in abdominal imaging, absorbs more photons (increased absorption efficiency). -5 lp/mm ...
General Diagnostic Radiology
General Diagnostic Radiology

... on from film exam passing that consists the through radiologist ofsystem, passing the selected interprets.  a small body Aamount contrast areas of in Contrast bowel other X-ray imaging or (radiography) may other be procedures. internal introduced is structures.  commonly through used X-rays an IV to ...
CHARACTERISTICS of MEDICAL IMAGES
CHARACTERISTICS of MEDICAL IMAGES

... Our Goal ...
outpatient consultation for radioactive iodine therapy
outpatient consultation for radioactive iodine therapy

... Indication: Treatment of recurrent thyroid cancer with I-131. Date surgery: [date] Surgical pathology: [...] MACIS: [...] Clinical History: [...] DISCUSSION: The history and current status were reviewed with the patient. The risks, benefits, and alternatives to treatment were discussed and the patie ...
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... Our study found that absorbed radiation doses given to patients in RP-CT thorax scans are four times higher, on average, than the doses given in DG-CT scans. The differences are largest between patients with a low BMI. It is important to emphasis the use of patient size modified CT protocols even wh ...
Radiation Overview - American Nuclear Society
Radiation Overview - American Nuclear Society

... • Carbon-14 (air) • Lead-210 (radon) ...
MAIN SYSTEM SPECIFICATIONS Maximum number of slices 160
MAIN SYSTEM SPECIFICATIONS Maximum number of slices 160

... 3D perfusion processing and 3D CT DSA using the same scan data. ...
Physics of Radiology
Physics of Radiology

... • CT scan – a diagnostic test that combines X-rays with computer technology • A series of X-rays from many different angles are used to create a cross-sectional image of the patient’s body ...
Ascentis Subject Set Unit Specifications – Physics
Ascentis Subject Set Unit Specifications – Physics

...  the sub-atomic components of an atom.  beta (β) and gamma (γ) radiation decay equations using a periodic table  the mechanism of gamma (γ) rays indirect ionisation.  characteristic radioactive decay curves and the “spin-spin” interaction.  calculations of decay rates, values of half-lives and ...
Image-Guided Radiation Therapy
Image-Guided Radiation Therapy

...  Accurate daily patient set-up  Conformal avoidance of radiosensitive structures ...
History of radiology
History of radiology

... Primary beam of X-rays traverse the patient. In the patient a part of X-rays is absorbed (photoeffect) and the attenuated beam continues to the detector and creates the image. Another part is scattered (Compton´s effect) The degree of absorption depends on the wavelength and on the effective atomic ...
Image Guided Radiation Therapy: Brachytherapy - NA
Image Guided Radiation Therapy: Brachytherapy - NA

... • CT (4D) for anatomy delineation • Multimodalilty image registration • Beam selection and dose optimization • Phase selection (4D) – Assuming reproducible cycles – Assuming correlation between phase and taret motion ...
Image-guided Radiation Therapy (IGRT)
Image-guided Radiation Therapy (IGRT)

... IGRT is used to treat tumors in areas of the body that are prone to movement, such as the lungs (affected by breathing), liver, and prostate gland, as well as tumors located close to critical organs and tissues. It is often used in conjunction with intensity-modulated radiation therapy (IMRT), proto ...
dose optimisation in ct policy - European Society of Radiology
dose optimisation in ct policy - European Society of Radiology

... • Raman SP et al (2013) CT dose reduction applications: available tools on the latest generation of CT scanners. J Am Coll Radiol 10: 37-41 • Beeres M et al (2014) Chest-abdomen-pelvis CT for staging in cancer patients: dose effectiveness and image quality using automated attenuation-based tube ...
RAD 254 Computed Tomography
RAD 254 Computed Tomography

... imaging portion (often times a remote monitor is set up for the radiologist – can be a hassle) ...
L6 Optimizing the Image Ch. 7
L6 Optimizing the Image Ch. 7

... or restlessness of the patient during an x-ray exposure • May be prevented by ...
Radiation Your Guide to Understanding
Radiation Your Guide to Understanding

... The content presented here is for your information only. It is not a substitute for professional medical advice, and it should not be used to diagnose or treat a health problem or disease. Please consult your healthcare provider if you have any questions or concerns. More health information is avail ...
Junior Radiology
Junior Radiology

... threshold dose must be attained for the effect to occur. Examples include cataract formation, skin reddening (erythema), and sterility. Also referred to as “non-stochastic” effects The effect may (potentially) occur following any amount of exposure – there is no threshold. Examples include cancer an ...
X-Rays - LSU School of Medicine
X-Rays - LSU School of Medicine

... threshold dose must be attained for the effect to occur. Examples include cataract formation, skin reddening (erythema), and sterility. Also referred to as “non-stochastic” effects The effect may (potentially) occur following any amount of exposure – there is no threshold. Examples include cancer an ...
The Role of Radiation in the Treatment of Anal Sac Gland
The Role of Radiation in the Treatment of Anal Sac Gland

... following surgery or alone. Definitive radiation involves between 16 and 20 treatments, delivered daily (usually Monday – Friday). Definitive radiation therapy, in combination with surgery and chemotherapy has been shown to be effective. In one study (Turek M M, 2003)15 dogs were treated with surger ...
oOo. Vascular Anomalies Clinic Referral Form .oOo. Telephone: 604
oOo. Vascular Anomalies Clinic Referral Form .oOo. Telephone: 604

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Volunteering Objectives
Volunteering Objectives

... (Those listed in red are the required objectives for volunteers at Sutter Santa Rosa) • To "shadow" and observe an RT through daily duties to learn how these are carried out in accordance with hospital policies and philosophy. • To observe different radiographic positioning techniques and procedures ...
Radiation Exposure in Medical Procedures Medical Imaging
Radiation Exposure in Medical Procedures Medical Imaging

... Radiation is used in many of today’s medical imaging exams such as x-rays, computed tomography(CT), and mammography, just to name a few. During x-ray exams the x-rays pass through the patient and then strike a specific kind of imaging plate creating an image illustrating where the bones, organs, and ...
Neurologic Tests Part 1
Neurologic Tests Part 1

... receptor ligand systems ...
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Radiosurgery

Radiosurgery is surgery using radiation, that is, the destruction of precisely selected areas of tissue using ionizing radiation rather than excision with a blade. Like other forms of radiation therapy, it is usually used to treat cancer. Radiosurgery was originally defined by the Swedish neurosurgeon Lars Leksell as “a single high dose fraction of radiation, stereotactically directed to an intracranial region of interest”. In stereotactic radiosurgery (SRS), the word stereotactic refers to a three-dimensional coordinate system that enables accurate correlation of a virtual target seen in the patient's diagnostic images with the actual target position in the patient anatomy.Technological improvements in medical imaging and computing have led to increased clinical adoption of stereotactic radiosurgery and have broadened its scope in recent years. Notwithstanding these improvements, the localization accuracy and precision that are implicit in the word “stereotactic” remain of utmost importance for radiosurgical interventions today. Stereotactic accuracy and precision are significantly increased by using a device known as the N-localizer that was invented by the American physician and computer scientist Russell Brown and that has achieved widespread clinical use in several stereotactic surgical and radiosurgical systems.Recently, the original concept of radiosurgery has been expanded to include treatments comprising up to five fractions, and stereotactic radiosurgery has been redefined as a distinct neurosurgical discipline that utilizes externally generated ionizing radiation to inactivate or eradicate defined targets in the head or spine without the need for a surgical incision. Irrespective of the similarities between the concepts of stereotactic radiosurgery and fractionated radiotherapy, and although both treatment modalities are reported to have identical outcomes for certain indications, the intent of both approaches is fundamentally different. The aim of stereotactic radiosurgery is to destroy target tissue while preserving adjacent normal tissue, where fractionated radiotherapy relies on a different sensitivity of the target and the surrounding normal tissue to the total accumulated radiation dose. Historically, the field of fractionated radiotherapy evolved from the original concept of stereotactic radiosurgery following discovery of the principles of radiobiology: repair, reassortment, repopulation, and reoxygenation. Today, both treatment techniques are complementary as tumors that may be resistant to fractionated radiotherapy may respond well to radiosurgery and tumors that are too large or too close to critical organs for safe radiosurgery may be suitable candidates for fractionated radiotherapy.
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