ray beam limitation and dose reduction
Orthogonal ray imaging: from dose monitoring in external beam therapy to low-dose morphologic imaging with scanned megavoltage X-rays
... 2.4 Experimental results with a PMMA phantom Good visual correlation between measured data and simulated dose profile. Sim ˜oes et al, IEEE TNS, 2013 Sep[r] ...
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X-Ray Beam Characteristics And Radiation Dose Deposition To Soft Tissue From Fluoroscopic X-Ray Beams Incorporating Copper Filtration
... fluoroscopic data, and the current work attempts to add information regarding newer-generation fluoroscopic approaches to this knowledge base. For the purpose of this study, imaging protocols shall refer to the selected ...
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Reduction of the Beam Hardening Artifacts in the X Ray Computer Tomography: Energy Discrimination with a Photon Counting Detector
... pencil-shaped beam. Assigning the line con- necting the X-ray tube and the detector to be 0 mm, data are measured by one second for each 1 mm from −16 to +16 ...
5
Compressed Sensing Based Reconstruction Algorithm for X-ray Dose Reduction in Synchrotron Source Micro Computed Tomography
... 4 of a reconstructed slice of a femoral cortical bone sample demonstrate the superiority of the proposed algorithm compared to other existing algorithms. The manuscript included in Chapter 5 proposes a compressed sensing ...
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ABSORBED DOSE DETERMINATION IN EXTERNAL BEAM RADIOTHERAPY
... absorbed dose to water, since absolute calorimetric measurements in water are more ...absorbed dose to graphite were satisfactory and, consequently, the development of standards of absorbed dose to ...
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Organ dose determination in X-ray imaging
... fetal dose conversion coefficients were calculated relative to the mean CTDI vol (Study II) and DAP (Study IV), ...fetal dose conversion coefficients was that they are more applicable than absolute ...
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Quantifying the image quality and dose reduction of respiratory triggered 4D cone-beam computed tomography with patient-measured breathing.
... et al 2008b, Rosu and Hugo 2012, Fast et al 2013). Furthermore, Fast et al point out that making an improvement in one of these problems tends to come at the cost of degrading one of the others (Fast et al 2013). There ...
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Optimal dose reduction algorithm using an attenuation-based tube current modulation method for cone-beam CT imaging
... radiation dose given to patients, a tube current modulation (TCM) method has been widely used in diagnostic CT ...optimized dose reductions without degrading image quality for kV-CBCT ...organ dose ...
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Artifacts from manganese reduction in rock samples prepared by focused ion beam (FIB) slicing for X-ray microspectroscopy
... the dose of 10 % compositional change of a species, is of the order of 10 −3 to 10 −2 C cm −2 (Pantano and Madey, 1981) and thus well within reach of our SEM-assisted FIB preparation ...tron beam ...
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Biological Dose Estimation Model for Proton Beam Therapy
... In general, the phenomenological parameterization of Wilkens and Olfke [22] may need to be further genera- lized to wider sample of tissues but it gives the simplest way to link proton and x-ray therapies. ...
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Biological Dose Estimation Model for Proton Beam Therapy
... of beam range (as the energy decreases) that could increase the biological effect of proton radiation in the distal regions of the dose deposition [15] [19] [20] ...(physical) dose and the RBE, ...
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Radiation Dose Measurements in Routine X ray Examinations
... Radiation protection is an important concept in diagnostic radiology. The most important consideration in protecting the patient is to ensure that images of sufficient quality for accurate diagnosis are produced without ...
8
Compressed Sensing for Dose Reduction in STEM Tomography
... STEM offers several advantages over conventional elec- tron tomography, such as a better signal-to-noise ratio (SNR) and enhanced contrast [2, 3, 4]. Yet, it suffers from the same experimental limitation: ...
5
Comparison of dose–volume histograms between proton beam and X-ray conformal radiotherapy for locally advanced non-small-cell lung cancer
... the dose –volume histogram (DVH) between proton beam therapy (PBT) and X-ray conformal radiotherapy (XCRT) for locally advanced non-small-cell lung cancer (NSCLC), according to the tumor ...treatment ...
7
Reduction of IMRT beam complexity through the use of beam modulation penalties in the objective function
... of beam complexity on treatment planning, delivery, and quality assurance, several methods have been proposed to reduce the ...increased beam smoothness and delivery ...penalize beam modulation in ...
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IAEA-TECDOC-1560 Dose Reporting in Ion Beam Therapy
... reviewed: reduction of radioresistance due to hypoxia and poor reoxygenation in some tumours, and the lesser importance of repair phenomena which are a problem in controlling repair-proficient photon- resistant ...
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X-ray dose reduction using additional copper filtration for abdominal digital radiography: Evaluation using signal difference-to-noise ratio
... radiation dose required to obtain an adult abdominal radiograph is at least 20 times more than required to obtain an adult chest radiograph, according to several national diagnostic reference levels [11], and ...
22
Reducing Radiation Dose by Using Pulse X Ray Apparatus
... creates harder radiation. The X-ray tube’s performance in good conditions in terms of maximum acceptable heat load of the anode should be considered as one of the machines’ advantages. At present the operating ...
5
Does the use of additional X-ray beam filtration during cine acquisition reduce clinical image quality and effective dose in cardiac interventional imaging?
... 17 Limitations of Study Due to ethical considerations, use of the two acquisition modes could not be entirely randomized during patient PCI procedures. The X-ray system operator utilised the standard acquisition ...
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Radiation Dose Reduction Strategies for Neuroradiology CT Protocols
... radiation dose mea- sured from 14 contiguous sections and normalized to beam width and took into account the radiation dose delivered both within and beyond the scanning ...radiation beam, and ...
5