Dynamic Contrast-Enhanced MRI of Prostate Cancer at 3 T: A Study
... and compared for cancer, inflammation, and healthy peripheral zone: Ktrans (forward volume transfer constant), kep (reverse reflux rate constant between extracellular space and plasma), ve (the fractional volume of extracellular space per unit volume of tissue), and the area under the gadolinium con ...
... and compared for cancer, inflammation, and healthy peripheral zone: Ktrans (forward volume transfer constant), kep (reverse reflux rate constant between extracellular space and plasma), ve (the fractional volume of extracellular space per unit volume of tissue), and the area under the gadolinium con ...
Radiation dose reduction in computed tomography
... lation [5,7,8] . One study suggested that as much as 1.5–2% of cancers may eventually be caused by the radiation dose currently used in CT [5] . These estimates, however, remain highly controversial ...
... lation [5,7,8] . One study suggested that as much as 1.5–2% of cancers may eventually be caused by the radiation dose currently used in CT [5] . These estimates, however, remain highly controversial ...
CLASSlCAL RADIATION THERAPY
... Basic dose distribution data are usually measured in a water phantom, which closely approximates the radiation absorption and scattering properties of muscle and other soft tissues. Another reason for the choice ofwater as a phantom material is that it is universally available with reproducible radi ...
... Basic dose distribution data are usually measured in a water phantom, which closely approximates the radiation absorption and scattering properties of muscle and other soft tissues. Another reason for the choice ofwater as a phantom material is that it is universally available with reproducible radi ...
chapter 221. x-rays in the healing arts general provisions
... (iii) For other equipment, peak tube potential in kV and either tube current in mA and exposure time in seconds or the product of tube current and exposure time in mAs. Therapeutic X-ray system—A system design for irradiation of a part of the human body for the purpose of treatment or alleviation of ...
... (iii) For other equipment, peak tube potential in kV and either tube current in mA and exposure time in seconds or the product of tube current and exposure time in mAs. Therapeutic X-ray system—A system design for irradiation of a part of the human body for the purpose of treatment or alleviation of ...
Trends in radiation protection of positron emission tomography
... tomography (PET) and computed tomography (CT) on a single gantry as a hybrid PET/CT scanner. This provides both anatomical and functional images of the patient as a fused image. Since its introduction in 1998 (Beyer et al., 2000), PET/ CT has become an important imaging modality worldwide. PET/CT is ...
... tomography (PET) and computed tomography (CT) on a single gantry as a hybrid PET/CT scanner. This provides both anatomical and functional images of the patient as a fused image. Since its introduction in 1998 (Beyer et al., 2000), PET/ CT has become an important imaging modality worldwide. PET/CT is ...
Patient Dose in common CT examinations-2003
... tissues in the body. The first commercially viable CT scanner was invented by Sir Godfrey Hounsfield in 1972, who in 1979 shared the Nobel Prize in Medicine with Cormack. Since the invention of the first CT scanner numerous developments were made. An important advance in CT imaging was the advent of ...
... tissues in the body. The first commercially viable CT scanner was invented by Sir Godfrey Hounsfield in 1972, who in 1979 shared the Nobel Prize in Medicine with Cormack. Since the invention of the first CT scanner numerous developments were made. An important advance in CT imaging was the advent of ...
radiation medicine qa
... his having set up a business for the production of his invention, a dosemeter based on an electrostatic relay. It was out of sheer friendship back then that I went on a series of trips either to set up dosemeters or to instruct their users in the operation. Dr. Hammer himself had serious financial d ...
... his having set up a business for the production of his invention, a dosemeter based on an electrostatic relay. It was out of sheer friendship back then that I went on a series of trips either to set up dosemeters or to instruct their users in the operation. Dr. Hammer himself had serious financial d ...
Vessel Imaging by Interferometric Phase-Contrast X
... CT images, whereas the absorption-contrast x-ray image could not depict the vessel structure at all. Although the vessel 0.05 mm in diameter was depicted by the blood itself,13 the vessel 0.03 mm in diameter was revealed clearly by physiological saline. This significant image contrast produced by ph ...
... CT images, whereas the absorption-contrast x-ray image could not depict the vessel structure at all. Although the vessel 0.05 mm in diameter was depicted by the blood itself,13 the vessel 0.03 mm in diameter was revealed clearly by physiological saline. This significant image contrast produced by ph ...
Tumor Dosimetry in a Phase I Study of Lu(177)-DOTA
... Lu is a β-emitter which also emits γ-particles with energies that lie in a range suitable ...
... Lu is a β-emitter which also emits γ-particles with energies that lie in a range suitable ...
Advances in Magnetic Resonance Imaging: How They Are
... Recently, some studies have also analysed the practicability of MR-guided biopsy (Fig. 3). Hambrock et al. [20] tested the feasibility of translating maps of potential areas of tumour in the prostate, obtained from multiparametric 3T MRI data (including T2W MRI, DWI, and DCE-MRI), for directing MR-g ...
... Recently, some studies have also analysed the practicability of MR-guided biopsy (Fig. 3). Hambrock et al. [20] tested the feasibility of translating maps of potential areas of tumour in the prostate, obtained from multiparametric 3T MRI data (including T2W MRI, DWI, and DCE-MRI), for directing MR-g ...
19 2D and 3D Planning in Brachytherapy
... and require the use of special X-ray visible markers that are placed within the catheters in order to make them visible for the reconstruction. The available technology enables effective and fast catheter reconstruction using CT imaging and currently US imaging using automatic reconstruction tools ( ...
... and require the use of special X-ray visible markers that are placed within the catheters in order to make them visible for the reconstruction. The available technology enables effective and fast catheter reconstruction using CT imaging and currently US imaging using automatic reconstruction tools ( ...
Assessing The Clinical Application Of The Van Herk Margin Formula
... 4.2 Evaluation of the VHMF in lung for systematic error ............................................................ 82 4.2.1 Comparison of shifted and accumulated plans ............................................................. 83 4.3 Investigation of tissue density.............................. ...
... 4.2 Evaluation of the VHMF in lung for systematic error ............................................................ 82 4.2.1 Comparison of shifted and accumulated plans ............................................................. 83 4.3 Investigation of tissue density.............................. ...
Evaluation of the Three Dimensional Localization
... mm. With the dosimetric accuracy of treatment delivery, the average minimum dose, mean dose, and maximum dose in PTV of the original plans and the CBCT-based plans were 95.45% ± 3.80% and 92.88% ± 3.25%, 110.59% ± 1.81% and 110.11%±2.40%, 116.55%±3.11% and 115.93%±2.78%, respectively. In the origin ...
... mm. With the dosimetric accuracy of treatment delivery, the average minimum dose, mean dose, and maximum dose in PTV of the original plans and the CBCT-based plans were 95.45% ± 3.80% and 92.88% ± 3.25%, 110.59% ± 1.81% and 110.11%±2.40%, 116.55%±3.11% and 115.93%±2.78%, respectively. In the origin ...
ICRP Publication 105
... other radiation applications, in that generally the very same person enjoys the benefits and suffers the risks associated with a procedure. (There may be other considerations: attendant occupational exposures could be correlated with patient doses or sometimes there can be a trade-off; screening progra ...
... other radiation applications, in that generally the very same person enjoys the benefits and suffers the risks associated with a procedure. (There may be other considerations: attendant occupational exposures could be correlated with patient doses or sometimes there can be a trade-off; screening progra ...
ICRP PUBLICATION 121: Radiological Protection in Paediatric
... not sufficiently efficacious, is contrary to good medical practice and not sound radiological protection. Justification is also a key principle in medical exposures. Publication 105 describes three levels of justification, one of which is justification of individual exposures. This is particularly importan ...
... not sufficiently efficacious, is contrary to good medical practice and not sound radiological protection. Justification is also a key principle in medical exposures. Publication 105 describes three levels of justification, one of which is justification of individual exposures. This is particularly importan ...
Technical assessment of a cone-beam CT scanner
... application-specific embodiments of cone-beam CT (CBCT) have emerged over the last decade. Most current embodiments of CBCT employ variations of the Feldkamp-Davis-Kress (FDK) algorithm1 for 3D filtered backprojection, although CBCT will similarly benefit from advances in iterative reconstruction te ...
... application-specific embodiments of cone-beam CT (CBCT) have emerged over the last decade. Most current embodiments of CBCT employ variations of the Feldkamp-Davis-Kress (FDK) algorithm1 for 3D filtered backprojection, although CBCT will similarly benefit from advances in iterative reconstruction te ...
Understanding Radiation Units - Radiation Protection of Patients
... - Dose quantities external to the patient’s body. - Dose quantities to estimate risks of skin injuries and effects that have threshold. - Dose quantities to estimate stochastic risks. ...
... - Dose quantities external to the patient’s body. - Dose quantities to estimate risks of skin injuries and effects that have threshold. - Dose quantities to estimate stochastic risks. ...
CLINICAL IMPLEMENTATION OF IMAGE
... factors such as drug distribution. These R2 values are much stronger than those ...
... factors such as drug distribution. These R2 values are much stronger than those ...
Metabolic Imaging and Other Applications of Hyperpolarized 13C1
... standard MRI system. A number of papers have described many of the special features (10, 19, 20, 23) that characterize the 13C hyperpolarization imaging. A paramagnetic contrast medium operates by altering the relaxation times of the nuclei in the surrounding tissues. That is, the signal is generate ...
... standard MRI system. A number of papers have described many of the special features (10, 19, 20, 23) that characterize the 13C hyperpolarization imaging. A paramagnetic contrast medium operates by altering the relaxation times of the nuclei in the surrounding tissues. That is, the signal is generate ...
CARDIAC CATHETERIZATION EQUIPMENT PERFORMANCE AAPM REPORT NO. 70 Report of Task Group #17
... This diameter provides a reasonable compromise between the required tube loading and the delay required to accelerate the anode rotational speed from low speed [approximately 4000 revolutions per minute (rpm)] used during fluoroscopy to high speed (10,000 rpm) used during cine acquisitions. The surf ...
... This diameter provides a reasonable compromise between the required tube loading and the delay required to accelerate the anode rotational speed from low speed [approximately 4000 revolutions per minute (rpm)] used during fluoroscopy to high speed (10,000 rpm) used during cine acquisitions. The surf ...
12 Physics and Clinical Aspects of Brachytherapy
... source’s half-life determines its shelf life, namely, whether a source can be stored and used repeatedly over a long period of time. Sources with shorter halflives, such as 125I and 103Pd sources, need to be purchased and received with an accurate knowledge of the source strength relative to the int ...
... source’s half-life determines its shelf life, namely, whether a source can be stored and used repeatedly over a long period of time. Sources with shorter halflives, such as 125I and 103Pd sources, need to be purchased and received with an accurate knowledge of the source strength relative to the int ...
Chapter 01
... Measurements (ICRU) reports 50 and 62 formally define planning volumes and margins (ICRU 1993,1999). Portal imaging is traditionally done only on a weekly basis. The philosophy of portal imaging in the past has been focused on quality assurance (QA) of major errors in treatment ports or setup errors ...
... Measurements (ICRU) reports 50 and 62 formally define planning volumes and margins (ICRU 1993,1999). Portal imaging is traditionally done only on a weekly basis. The philosophy of portal imaging in the past has been focused on quality assurance (QA) of major errors in treatment ports or setup errors ...
The Evolution of Multiple Sclerosis Lesions on Serial MR
... Fig 1. The life of a multiple sclerosis lesion. Serial MR follow-up of a multiple sclerosis lesion (arrows) in the right parietooccipital white matter of a 37-year-old man. Contrast-enhanced (top) and proton density–weighted (bottom) MR images of the brain at a comparable anatomic level are shown at ...
... Fig 1. The life of a multiple sclerosis lesion. Serial MR follow-up of a multiple sclerosis lesion (arrows) in the right parietooccipital white matter of a 37-year-old man. Contrast-enhanced (top) and proton density–weighted (bottom) MR images of the brain at a comparable anatomic level are shown at ...
article in press - The EndoExperience
... diagnostics and surgery planning [1,2]. Conventional CT protocols are generally associated with relatively high radiation dose levels and even clinical protocols for multi-slice CT (MSCT) still show high doses [3,4]. The introduction of Cone Beam Computed Tomography (CBCT) holds promising potential ...
... diagnostics and surgery planning [1,2]. Conventional CT protocols are generally associated with relatively high radiation dose levels and even clinical protocols for multi-slice CT (MSCT) still show high doses [3,4]. The introduction of Cone Beam Computed Tomography (CBCT) holds promising potential ...
Cone Beam Computed Tomography for Adaptive
... correction strategies from look-up tables [8,11] or based on rigid registration algorithms [14]. Several scatter correction methods have been developed [18-24] in order to make CBCTbased dosimetry reliable. CBCT datasets have also been applied to adaptive plans to reduce the planning and target marg ...
... correction strategies from look-up tables [8,11] or based on rigid registration algorithms [14]. Several scatter correction methods have been developed [18-24] in order to make CBCTbased dosimetry reliable. CBCT datasets have also been applied to adaptive plans to reduce the planning and target marg ...
Proton therapy
Proton therapy or proton beam therapy is a medical procedure, a type of particle therapy that uses a beam of protons to irradiate diseased tissue, most often in the treatment of cancer. Proton therapy's chief advantage over other types of external beam radiotherapy is that as a charged particle the dose is deposited over a narrow range and there is minimal exit dose.