Four Dimensional Computed Tomography (4D-CT)
Improvements in four-dimensional and dual energy computed tomography
... stable enough and too high mA saturating the detector. As a result, sometimes only one dose level was possible for the high energy scan, limiting the dose allocations that could be studied. Since the X-RAD was designed ...
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Evaluating the reliability of four-dimensional computed tomography scans of the wrist
... Chapter 7: Discussion Overall, our study suggests good inter- and intra-observer reliability for the assessment of scapholunate instability in 4D CT wrist scans. The fact that the intra- observer ...
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Comparison of spirometry and abdominal height as four-dimensional computed tomography metrics in lung
... appears bright in the sample frame when the CT radiation is on. The video was downloaded from the camera and cropped to reduce the video file size with commercial video process- ing software 共 PREMIERE V6.5, Adobe ...
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A longitudinal four-dimensional computed tomography and cone beam computed tomography dataset for image-guided radiation therapy research in lung cancer.
... 4D-CBCT images were acquired on a commercial CBCT scanner (On-Board Imager v1.3, Varian Medical Systems, Inc.) after in-house modification. The same external breathing surrogate used for 4DCT was integrated into ...
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Design and Optimization of Four-dimensional Cone-beam Computed Tomography in Image-guided Radiation Therapy
... in 4D-CBCT [36, ...the 4D image set was chosen as the reference phase, and the relative target displacement in each of the other phases to the reference phase were ...work, four resolution levels ...
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Respiratory Motion Guided Four Dimensional Cone Beam Computed Tomography: Encompassing Irregular Breathing
... Abstract. Four dimensional cone beam computed tomography (4DCBCT) images suffer from angular under sampling and bunching of projections due to a lack of feedback between the respiratory signal ...
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A comparison of dosimetric variance for external-beam partial breast irradiation using three-dimensional and four-dimensional computed tomography
... A valuable feature of 4DCT is that respiratory motion can be assessed so that population-based or site-specific tumor motion information can be acquired to guide the expansion of the TB based on 3DCT. Because 3DCT does ...
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Correlation of primary middle and distal esophageal cancers motion with surrounding tissues using four-dimensional computed tomography
... We assessed the correlation of GTV motion with the displacement of lung and apex of the diaphragm, and the results have shown that the motion of tumor correlated well with both the right lung and the left lung in the LR ...
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Quality assurance of four-dimensional computed tomography in a multicentre trial of stereotactic body radiotherapy of centrally located lung tumours
... the CT scanners and scan protocols evaluated in the present study is given in Table 1 ...the CT models used are already on the market for about ten ...
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Velopharyngeal closure analysis using four-dimensional computed tomography: a pilot study of healthy volunteers and adult patients with cleft palate
... therefore, some discrepancies might exist between the results obtained from this method and the actual hypernasality. In fact, in this study, we detected micro-VPI in five participants, although none of the participants ...
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Accuracy Comparison of 4D Computed Tomography (4DCT) and 4D Cone Beam Computed Tomography (4DCBCT)
... acquisition time. While CBCT images were acquired with a large flat-panel de- tector, CT images were acquired with a regular 16-row detector (around 2.0 cm in z-direction). The consequence of this is that tumor ...
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Computed Tomography (CT) - Sinuses
... With CT scanning, numerous x-ray beams and a set of electronic x-ray detectors rotate around you, measuring the amount of radiation being absorbed throughout your ...monitor. CT imaging is sometimes ...
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COMPUTED TOMOGRAPHY SYSTEMS (CT)
... 4.1 The CT X-ray Tube ("tube") warranty period is for twelve (12) months from the date of installation or availability for patient use, whichever occurs first. If a tube becomes inoperative or fails when operated ...
Computed Tomography (CT) - Body
... In many ways CT scanning works very much like other x-ray examinations. Different body parts absorb the x-rays in varying degrees. It is this crucial difference in absorption that allows the body parts to be ...
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Computed Tomography (CT) - Chest
... In many ways CT scanning works very much like other x-ray examinations. Different body parts absorb the x-rays in varying degrees. It is this crucial difference in absorption that allows the body parts to be ...
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Computed Tomography (CT) - Spine
... With CT scanning, numerous x-ray beams and a set of electronic x-ray detectors rotate around you, measuring the amount of radiation being absorbed throughout your ...monitor. CT imaging is sometimes ...
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Computed Tomography (CT) - Body
... With CT scanning, numerous x-ray beams and a set of electronic x-ray detectors rotate around you, measuring the amount of radiation being absorbed throughout your ...monitor. CT imaging is sometimes ...
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Computed Tomography (CT) of Orbital Pseudotumour
... The lacrimal type of pseudotumour is confmed to the superolateral aspect of the orbit with enlargement of the lacrimal gland and infiltration into the lateral aspect of the globe and la[r] ...
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Multislice computed tomography (CT) provides
... beam computed tomography (CBCT) and medical- grade CT in the context of evaluating the diagnostic value and accuracy of fiducial marker localization for reference marker–based guided surgery ...
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Children's (Pediatric) CT (Computed Tomography)
... However, CT scans result in a low-level ...avoid CT scans that are not clearly ...the CT settings based on the reason for the exam, the body area being examined, and the child's ...
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