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REVIEWS - Dental and Medical Problems
REVIEWS - Dental and Medical Problems

... orthodontic case clinician needs to thoroughly examine a  triad of anatomic structures: dentofacial skeleton, relation of dental arches and soft tissues profile. In this case “thorough” means a complex 3 dimensional set of anatomic data [2]. Despite the advances in medical imaging, it is still impos ...
Urothelial cancers: clinical and imaging evaluation
Urothelial cancers: clinical and imaging evaluation

... 5). Epithelial tumors can be assessed more accurately at the excretory or pyelographic phase and they appear as filling defects (1,2) (Figure 6). The bladder should be sufficiently full and distended for proper lesion evaluation (Figure 7). Reconstructed images in various planes enable better evalua ...
dave_1_Ana516
dave_1_Ana516

... Edema and tumor tissue characteristics) ...
Right Upper Quadrant Pain - American College of Radiology
Right Upper Quadrant Pain - American College of Radiology

... Safety Considerations in Pregnant Patients Imaging of the pregnant patient can be challenging, particularly with respect to minimizing radiation exposure and risk. For further information and guidance, see the following ACR documents:  ACR Practice Guideline for Imaging Pregnant or Potentially Preg ...
172 The shortest life expectancy is associated with which clinical
172 The shortest life expectancy is associated with which clinical

... 26 In the syndrome of prolonged compression of the head primary surgical debridement of the head wounds A. *Is early and is performed during the first hours in the injury admission ward B. Is postponed and is performed in the specialized facilities C. Surgical debridement is not performed D. Is late ...
DoseWatch - GE Healthcare
DoseWatch - GE Healthcare

... data. The DICOM standard introduced a network transaction that is typically initiated by modalities at the beginning and end of imaging acquisitions. The transaction, called the Modality Performed Procedure Step (MPPS), is sent to the Picture Archiving and Communication System (PACS) and / or Radiol ...
comparison of localization performance with implanted fiducial
comparison of localization performance with implanted fiducial

... (CBCT)– based setup corrections as compared with orthogonal megavoltage (MV) portal image-based corrections for patients undergoing external-beam radiotherapy of the prostate. Methods and Materials: Daily cone-beam CT volumetric images were acquired after setup for patients with three intraprostatic ...
mdct trauma protocol made efficient - SCBT-MR
mdct trauma protocol made efficient - SCBT-MR

... Body part Delay Recon Thickness Noise Index CTA of pelvis, ~ 23 sec 0.625 mm long bones bolus tracking ...
Advantages of monochromatic x-rays for imaging [5745-125]
Advantages of monochromatic x-rays for imaging [5745-125]

... quanta are absorbed in the object and less quanta will reach the detector and be registered. So there must be an optimum energy in between. This gives rise to the demand for a monochromatic X-ray source working at this very energy. A simulation study on this subject has been conducted by Boone and S ...
MAGNETIC RESONANCE IMAGING OF PAROTID
MAGNETIC RESONANCE IMAGING OF PAROTID

... Other series have been smaller or not focused specifically on MRI ...
Case 3
Case 3

... Clinical Staging • Synopsis- patient with rectal mass and perirectal tissue involvement, and clinically involved nodes • What is the clinical stage? ...
ACADEMIC PROGRAM RECOMMENDATIONS FOR GRADUATE DEGREES IN MEDICAL PHYSICS AAPM REPORT NO. 79
ACADEMIC PROGRAM RECOMMENDATIONS FOR GRADUATE DEGREES IN MEDICAL PHYSICS AAPM REPORT NO. 79

... and dosimetry. Quantities and units are introduced early so that radioactive decay and radiation interactions can then be discussed, with emphasis on energy transfer and dose deposition. Exponential attenuation under both narrow- and broad-beam conditions must be understood before a student can go o ...
Academic Program Recommendations For Graduate Degrees
Academic Program Recommendations For Graduate Degrees

... and dosimetry. Quantities and units are introduced early so that radioactive decay and radiation interactions can then be discussed, with emphasis on energy transfer and dose deposition. Exponential attenuation under both narrow- and broad-beam conditions must be understood before a student can go o ...
SPring-8 Joint Project for XFEL
SPring-8 Joint Project for XFEL

... light, atomic resolution can be achieved. Conventional X-ray sources (including synchrotron radiation sources) are not coherent (the wave field is not perfectly aligned). Laser can produce coherent light with a pair of mirrors. For X-rays, unfortunately, such mirrors cannot be used due to the low re ...
Mammography
Mammography

...  Targets used in combination with specific tube filters to achieve optimal energy spectra ...
PET On-Cology physics
PET On-Cology physics

... Normal Patchy atrial Uptake; This patient was likely not fasting *Usually it is difficult to differentiate physiologic vs inflammatory uptake on PET alone ...
Dosimetry of 3 CBCT devices for oral and maxillofacial radiology
Dosimetry of 3 CBCT devices for oral and maxillofacial radiology

... neck region directly exposed by each technique was estimated as 5% of the total body to calculate radiation weighted dose to the skin following the procedure used in a previous study.11 Similarly, muscle, adipose, connective tissue and lymphatic nodes exposures were estimated to represent 5% of the ...
Review of biomedical Čerenkov luminescence imaging applications
Review of biomedical Čerenkov luminescence imaging applications

... exploited for unique diagnostic biological sensing and imaging, with significantly expanded use just in the last half decade. Čerenkov Luminescence Imaging (CLI) has desirable capabilities for niche applications, using specially designed measurement systems that report on radiation distributions, ra ...
ct for techs_1 system components
ct for techs_1 system components

... Significant advances in technology throughout the 1960s and early 1970s resulted in the development of a type of medical imaging that could display anatomic structures without superimposition and with a significantly broader range of tissue contrast than by traditional x-ray methods. In 1973, the fi ...
3 JCI dosimetry for CT
3 JCI dosimetry for CT

... • Dose Measurement using Ionization Chamber ...
Cerebellopontine Angle Cavernous Angioma: In the Setting
Cerebellopontine Angle Cavernous Angioma: In the Setting

... cavernous malformations. The CT (A) demonstrated a noncalcified mass in the right CPA (arrow). A spinal cord mass at C5-6 is shown on the sagittal CT Myelogram (B) with MR imaging characteristics of a cavernous malformations as seen on sagittal T2WI (C). ©2015 MFMER | slide-6 ...
Dose Management Update for Advocate Healthcare
Dose Management Update for Advocate Healthcare

... The Joint Commission’s new imaging standards include a focus on protocol management The [critical access] hospital establishes or adopts diagnostic computed tomography (CT) imaging protocols based on current standards of practice, which address key criteria including clinical indication, contrast a ...
RMMP2002 - Department of Physics
RMMP2002 - Department of Physics

... Nicholas Spyrou is Professor of Radiation and Medical Physics and Chairman of Medical Physics. He is Director of the MSc course in Medical Physics and Co-ordinator of the BSc (Hons)/MPhys courses in Physics with Medical Physics. His first degree was in Nuclear Engineering, followed by postgraduate d ...
4DCT And Respiratory Motion Management Strategies In Lung
4DCT And Respiratory Motion Management Strategies In Lung

... 1. Identify the tumour position in real time 2. Anticipate the tumour motion to allow for time delays in the response of the beam-positioning system 3. Reposition the beam 4. Adapt the dosimetry to allow for changing lung volume and critical structure locations during the breathing cycle. ...
Prognostic Factors in Recurrent Glioblastoma Multiforme and
Prognostic Factors in Recurrent Glioblastoma Multiforme and

... been studied extensively, although the prognostic value of radiologic data, such as MR imaging and angiographic characteristics, has not been studied in depth. The purpose of this study was to determine whether radiologic data were prognostic factors among patients with recurrent glioblastoma multif ...
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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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