detector exposure indicator in ge x-ray systems
... or Dose/DAP calculation in GE Healthcare systems. The relationship between patient entrance dose and detector entrance dose depends on many variables including patient thickness, kV, collimation, etc. X-ray beam quality is different before and after passing through the patient and thereby DEI doesn’ ...
... or Dose/DAP calculation in GE Healthcare systems. The relationship between patient entrance dose and detector entrance dose depends on many variables including patient thickness, kV, collimation, etc. X-ray beam quality is different before and after passing through the patient and thereby DEI doesn’ ...
Quantitative assessment of scatter correction techniques
... rapidly evolved from its introduction in the medical field in the early 1970s, and its development through the decades has produced a profound change in the role of diagnostic imaging in medicine. Accurate, cross-scanner assessment of in-vivo air density used to quantitatively assess amount and dist ...
... rapidly evolved from its introduction in the medical field in the early 1970s, and its development through the decades has produced a profound change in the role of diagnostic imaging in medicine. Accurate, cross-scanner assessment of in-vivo air density used to quantitatively assess amount and dist ...
Dental Radiographic Examinations
... diseases, as well as to monitor dentofacial development and the progress or prognosis of therapy. Radiographic examinations can be performed using digital imaging or conventional film. The available evidence suggests that either is a suitable diagnostic method.2-4 Digital imaging may offer reduced r ...
... diseases, as well as to monitor dentofacial development and the progress or prognosis of therapy. Radiographic examinations can be performed using digital imaging or conventional film. The available evidence suggests that either is a suitable diagnostic method.2-4 Digital imaging may offer reduced r ...
Dental Radiographic Examinations
... diseases, as well as to monitor dentofacial development and the progress or prognosis of therapy. Radiographic examinations can be performed using digital imaging or conventional film. The available evidence suggests that either is a suitable diagnostic method.2-4 Digital imaging may offer reduced r ...
... diseases, as well as to monitor dentofacial development and the progress or prognosis of therapy. Radiographic examinations can be performed using digital imaging or conventional film. The available evidence suggests that either is a suitable diagnostic method.2-4 Digital imaging may offer reduced r ...
AAPM Report No 116A.qxd - dicom
... occurred. Technologists quickly learn that they can produce images of better quality if they increase their exposure techniques, resulting in less noisy images and avoiding radiologist complaints about noisy images. Average exposure levels tend to creep up over time if a clear indicator of exposure ...
... occurred. Technologists quickly learn that they can produce images of better quality if they increase their exposure techniques, resulting in less noisy images and avoiding radiologist complaints about noisy images. Average exposure levels tend to creep up over time if a clear indicator of exposure ...
Summary of Public Comment
... physicist prior to patient use. Such evaluation would validate that the unit is within proper operating specifications and ensure radiation safety to the patient. In regards to CT scanners that have had a major component change/service, I do not support this rule. I believe such language would negat ...
... physicist prior to patient use. Such evaluation would validate that the unit is within proper operating specifications and ensure radiation safety to the patient. In regards to CT scanners that have had a major component change/service, I do not support this rule. I believe such language would negat ...
An Exposure Indicator for Digital Radiography Report of AAPM Task
... occurred. Technologists quickly learn that they can produce images of better quality if they increase their exposure techniques, resulting in less noisy images and avoiding radiologist complaints about noisy images. Average exposure levels tend to creep up over time if a clear indicator of exposure ...
... occurred. Technologists quickly learn that they can produce images of better quality if they increase their exposure techniques, resulting in less noisy images and avoiding radiologist complaints about noisy images. Average exposure levels tend to creep up over time if a clear indicator of exposure ...
2011 SCCT guidelines on radiation dose and dose
... Cardiovascular CT should only be performed if indicated by best available evidence and published guidelines, appropriate use criteria, or certain clinical scenarios or patient-specific clinical factors/comorbidities that support testing for a given patient. The cardiovascular CT imaging protocol sho ...
... Cardiovascular CT should only be performed if indicated by best available evidence and published guidelines, appropriate use criteria, or certain clinical scenarios or patient-specific clinical factors/comorbidities that support testing for a given patient. The cardiovascular CT imaging protocol sho ...
Sample pages 1 PDF
... rotate around the patient (Fig. 1.2). In a MDCT system, the detector comprises several rows of 700 and more detector elements that cover a scan field of view (SFOV) of usually 50 cm. The X-ray attenuation of the object is measured by the individual detector elements. All measurement values acquired ...
... rotate around the patient (Fig. 1.2). In a MDCT system, the detector comprises several rows of 700 and more detector elements that cover a scan field of view (SFOV) of usually 50 cm. The X-ray attenuation of the object is measured by the individual detector elements. All measurement values acquired ...
this PDF file - African Journals Online
... year. On reaching this milestone, it has become necessary to objectively assess the advantages and disadvantages of the implemented PACS as perceived by users. We aim to use our findings to improve on perceived advantages and to act to correct flaws. For medical and surgical clinicians training at a ...
... year. On reaching this milestone, it has become necessary to objectively assess the advantages and disadvantages of the implemented PACS as perceived by users. We aim to use our findings to improve on perceived advantages and to act to correct flaws. For medical and surgical clinicians training at a ...
Specification And Acceptance Testing Of Computed
... The Computed Tomography (CT) Scanner Task Group was formed to provide a reference document of suggested procedures for acceptance testing of CT systems for clinical medical physicists. The AAPM first addressed performance testing of CT systems with the publication of AAPM Report No. 1, “Phantoms for ...
... The Computed Tomography (CT) Scanner Task Group was formed to provide a reference document of suggested procedures for acceptance testing of CT systems for clinical medical physicists. The AAPM first addressed performance testing of CT systems with the publication of AAPM Report No. 1, “Phantoms for ...
Overview of the DICOM Standard - VCL
... while avoiding possible confusion caused by multiple files for the same study. Keywords - DICOM, Medical Imaging, Mammography 1. INTRODUCTION During the last thirty years there has been a large development of digital technology. Computers have entered almost every aspect of our lives, so naturally t ...
... while avoiding possible confusion caused by multiple files for the same study. Keywords - DICOM, Medical Imaging, Mammography 1. INTRODUCTION During the last thirty years there has been a large development of digital technology. Computers have entered almost every aspect of our lives, so naturally t ...
The Radiation Protection Implications of the Use of Cone Beam
... and shape of the reconstructed image and is usually a cylindrical volume. At the time of writing, equipment is available that offers FOVs ranging from a few centimetres in height and diameter to 20 cm in height and diameter. On some equipment the FOV can be altered depending on the examination or pa ...
... and shape of the reconstructed image and is usually a cylindrical volume. At the time of writing, equipment is available that offers FOVs ranging from a few centimetres in height and diameter to 20 cm in height and diameter. On some equipment the FOV can be altered depending on the examination or pa ...
MR Imaging of Scrotal Tumors and Pseudotumors1
... and is lower in signal intensity than the testis on T2-weighted images. The rete testis radiates from the mediastinum testis to the surface of the tunica. High signal intensity of the testis on T2-weighted images allows excellent depiction of focal solid testicular masses, which most commonly have l ...
... and is lower in signal intensity than the testis on T2-weighted images. The rete testis radiates from the mediastinum testis to the surface of the tunica. High signal intensity of the testis on T2-weighted images allows excellent depiction of focal solid testicular masses, which most commonly have l ...
b05b-2014-rockwood-chapter-navigation_compressed
... is not only to enhance the surgical options in the preplanning stage but also to shorten surgery, an advantage that could be crucial for patient morbidity in a trauma set-up. Although computerized imaging equipment can be moved into the admitting area and/or the trauma unit of the emergency departme ...
... is not only to enhance the surgical options in the preplanning stage but also to shorten surgery, an advantage that could be crucial for patient morbidity in a trauma set-up. Although computerized imaging equipment can be moved into the admitting area and/or the trauma unit of the emergency departme ...
Compensators for dose and scatter management in cone
... on imaging techniques that lack the soft-tissue detectability necessary for precisely and accurately locating soft-tissue targets. Treatment setup relies on a combination of skin marks and/or megavoltage radiographs 共portal images兲 that can guide treatment based largely on the location of bony anato ...
... on imaging techniques that lack the soft-tissue detectability necessary for precisely and accurately locating soft-tissue targets. Treatment setup relies on a combination of skin marks and/or megavoltage radiographs 共portal images兲 that can guide treatment based largely on the location of bony anato ...
Image Guided Patient Setup
... be entirely different from those for hyperfractionated treatment protocols. Basically, the treatment procedure should be effective as well as efficient. Acquisition of an IGRT system should be guided by the department’s treatment philosophy, not the other way around. As stated earlier, these systems ...
... be entirely different from those for hyperfractionated treatment protocols. Basically, the treatment procedure should be effective as well as efficient. Acquisition of an IGRT system should be guided by the department’s treatment philosophy, not the other way around. As stated earlier, these systems ...
- Philips InCenter
... Intellispace portal for multi-modality viewing and analysis For advanced visualization and analysis, IntelliSpace Portal provides applications for easy, multi-modality and multi-vendor viewing and processing of neuro MR data. Dedicated offerings for neuroscientists A comprehensive, robust set of too ...
... Intellispace portal for multi-modality viewing and analysis For advanced visualization and analysis, IntelliSpace Portal provides applications for easy, multi-modality and multi-vendor viewing and processing of neuro MR data. Dedicated offerings for neuroscientists A comprehensive, robust set of too ...
PACS: Then and Now (… and Tomorrow !)
... Recognition of off-the-shelf nature of much PACS hardware Storage and communication devices are Class 1 if no lossy compression ...
... Recognition of off-the-shelf nature of much PACS hardware Storage and communication devices are Class 1 if no lossy compression ...
Abdominal CT: Comparison of Adaptive Statistical Iterative and
... results of prior studies (10) have indeed shown that other iterative reconstruction techniques can maintain a similar noise level regardless of radiation dose levels at up to a ninefold reduction in dose. Compared with the use of a fixed tube current, it is more difficult to control the extent of do ...
... results of prior studies (10) have indeed shown that other iterative reconstruction techniques can maintain a similar noise level regardless of radiation dose levels at up to a ninefold reduction in dose. Compared with the use of a fixed tube current, it is more difficult to control the extent of do ...
Fluoroscopy
Fluoroscopy /flɔrˈɒskəpi/ is an imaging technique that uses X-rays to obtain real-time moving images of the interior of an object. In its primary application of medical imaging, a fluoroscope /ˈflɔrɵˌskoʊp/ allows a physician to see the internal structure and function of a patient, so that the pumping action of the heart or the motion of swallowing, for example, can be watched. This is useful for both diagnosis and therapy and occurs in general radiology, interventional radiology, and image-guided surgery. In its simplest form, a fluoroscope consists of an X-ray source and a fluorescent screen, between which a patient is placed. However, since the 1950s most fluoroscopes have included X-ray image intensifiers and cameras as well, to improve the image's visibility and make it available on a remote display screen. For many decades fluoroscopy tended to produce live pictures that were not recorded, but since the 1960s, as technology improved, recording and playback became the norm.Fluoroscopy is similar to radiography and X-ray computed tomography (X-ray CT) in that it generates images using X-rays. The original difference was that radiography fixed still images on film whereas fluoroscopy provided live moving pictures that were not stored. However, today radiography, CT, and fluoroscopy are all digital imaging modes with image analysis software and data storage and retrieval. The use of X-rays, a form of ionizing radiation, requires the potential risks from a procedure to be carefully balanced with the benefits of the procedure to the patient. Because the patient must be exposed to a continuous source of x-rays instead of a momentary pulse, a fluoroscopy procedure generally subjects a patient to a higher absorbed dose of radiation than an ordinary (still) radiograph. Much research has been directed toward reducing radiation exposure, and recent advances in fluoroscopy technology such as digital image processing and flat panel detectors, have resulted in much lower radiation doses than former procedures.The type of fluoroscopy used in airport security (to check for hidden weapons or bombs) uses lower doses of radiation than medical fluoroscopy. It was formerly also used in retail stores in the form of shoe-fitting fluoroscopes, but such use was discontinued because it is no longer considered acceptable to use radiation exposure, however small the dose, for nonessential purposes. Only important applications such as health care, bodily safety, food safety, nondestructive testing, and scientific research meet the risk-benefit threshold for use. The reason for higher doses in medical applications is that they are more demanding about tissue contrast, and for the same reason they sometimes require contrast media.