Application of Partial Volume Effect Correction and 4D PET in the
... malignant lung lesions and the evaluation of response to radiation treatment [15–18]. In addition to respiratory motion, partial volume effect which arises from the finite spatial resolution of the scanner also results in inaccurate PET image quantification, particularly when the tumor size is less th ...
... malignant lung lesions and the evaluation of response to radiation treatment [15–18]. In addition to respiratory motion, partial volume effect which arises from the finite spatial resolution of the scanner also results in inaccurate PET image quantification, particularly when the tumor size is less th ...
Nuclear Medicine in Musculoskeletal Disorders
... variable or limited. Three-phase bone scintigraphy is currently the most used technique because it allows evaluating the degree of hyperemia (flow phase), increased of articular permeability (blood pool phase) and the presence of alterations in bone remodeling (bone tissue phase). Traditional techni ...
... variable or limited. Three-phase bone scintigraphy is currently the most used technique because it allows evaluating the degree of hyperemia (flow phase), increased of articular permeability (blood pool phase) and the presence of alterations in bone remodeling (bone tissue phase). Traditional techni ...
Policy Statement on Thyroid Shielding During Diagnostic Medical
... recently that a risk for exposure after the age of 15 has been observed (3-5). Among children, the risk of thyroid cancer resulting from radiation exposure is reduced proportionately with the dose of radiation received, although this relationship may not continue down to the lowest doses. (6). Thyro ...
... recently that a risk for exposure after the age of 15 has been observed (3-5). Among children, the risk of thyroid cancer resulting from radiation exposure is reduced proportionately with the dose of radiation received, although this relationship may not continue down to the lowest doses. (6). Thyro ...
communicating radiation risks in paediatric imaging
... health care. The level of awareness of health professionals about radiation doses and associated risks in medical imaging can be low. Referring medical practitioners need sufficient background, education and resources to communicate clearly and effectively about the benefits and risks of paediatric ...
... health care. The level of awareness of health professionals about radiation doses and associated risks in medical imaging can be low. Referring medical practitioners need sufficient background, education and resources to communicate clearly and effectively about the benefits and risks of paediatric ...
Influence of Voxel Size in the Diagnostic Ability of Cone Beam
... are on the buccal or lingual tooth surfaces (7). Aiming to evaluate how the elimination of structure superimposition improves visualization, da Silveira et al (8) conducted an in vitro study and observed that multislice computed tomography (MSCT) scans offer high sensitivity and specificity to the d ...
... are on the buccal or lingual tooth surfaces (7). Aiming to evaluate how the elimination of structure superimposition improves visualization, da Silveira et al (8) conducted an in vitro study and observed that multislice computed tomography (MSCT) scans offer high sensitivity and specificity to the d ...
Whole-Body Diffusion-Weighted MRI: Tips, Tricks, and Pitfalls
... whole-body MRI, stimulated in part by clinical needs and concerns about radiation safety in CT [19, 20]. Ionizing radiation from CT studies can result in a substantial increase in the lifetime risk of cancer [19]. As a result, CT manufacturers have responded by designing more efficient CT systems th ...
... whole-body MRI, stimulated in part by clinical needs and concerns about radiation safety in CT [19, 20]. Ionizing radiation from CT studies can result in a substantial increase in the lifetime risk of cancer [19]. As a result, CT manufacturers have responded by designing more efficient CT systems th ...
ICRP Publication 105
... on patient dose could be counterproductive to the medical purpose of the procedure. Therefore, source-related individual dose constraints are not relevant. Instead, Diagnostic Reference Levels (DRLs) for a particular procedure, which apply to groups of similar patients rather than individuals, are u ...
... on patient dose could be counterproductive to the medical purpose of the procedure. Therefore, source-related individual dose constraints are not relevant. Instead, Diagnostic Reference Levels (DRLs) for a particular procedure, which apply to groups of similar patients rather than individuals, are u ...
Garba_Idris_MASTERS
... optimisation of radiation protection. Furthermore, the development of DRLs for the local context is advised. These reference doses are a guide to the expected exposure dose from a procedure and are useful as an investigation tool to identify incidences where patient doses are unusually high. Methodo ...
... optimisation of radiation protection. Furthermore, the development of DRLs for the local context is advised. These reference doses are a guide to the expected exposure dose from a procedure and are useful as an investigation tool to identify incidences where patient doses are unusually high. Methodo ...
Myocardial Perfusion Imaging With Rb-82 PET
... ventricular ejection function (LVEF), myocardial perfusion, wall motion, and wall thickening. Positron emission tomography (PET) and single photon emission computed tomography (SPECT) are two modalities that can be used to quantify the left global and regional perfusion at rest and stress. While PET ...
... ventricular ejection function (LVEF), myocardial perfusion, wall motion, and wall thickening. Positron emission tomography (PET) and single photon emission computed tomography (SPECT) are two modalities that can be used to quantify the left global and regional perfusion at rest and stress. While PET ...
Fetal magnetic resonance imaging: jumping from 1.5 to 3 tesla
... the same signal strength is to be maintained, repetition time should be increased. However an increase in repetition time results in unwanted increased acquisition time and potentially worsening motion artifact of a highly mobile fetus. Our current 3-T protocols (Tables 1 and 2) reflect an increase ...
... the same signal strength is to be maintained, repetition time should be increased. However an increase in repetition time results in unwanted increased acquisition time and potentially worsening motion artifact of a highly mobile fetus. Our current 3-T protocols (Tables 1 and 2) reflect an increase ...
Utility of Preoperative Computed Tomography and Magnetic
... study, as MRI has been shown to be superior for soft tissue abnormities and the absence of a cochlear nerve. However, it is very rare for an MRI to show a significant abnormality if the CT was read as normal. On review of the literature, there is not a single case of a cochlear implant candidate wit ...
... study, as MRI has been shown to be superior for soft tissue abnormities and the absence of a cochlear nerve. However, it is very rare for an MRI to show a significant abnormality if the CT was read as normal. On review of the literature, there is not a single case of a cochlear implant candidate wit ...
example from X-ray Diagnostic Radiology
... QUALITY ASSURANCE IN DIAGNOSTIC RADIOLOGY (Regulations..) z ...
... QUALITY ASSURANCE IN DIAGNOSTIC RADIOLOGY (Regulations..) z ...
AAPM Report No 121
... For both XRII and flat-panel imaging detectors the photon energy distribution of the radiation incident on the detector, the spectral sensitivity of the detector, the energy conversion efficiency, and the spatial sampling array will determine the absorbed energy fluence per picture element (pixel) a ...
... For both XRII and flat-panel imaging detectors the photon energy distribution of the radiation incident on the detector, the spectral sensitivity of the detector, the energy conversion efficiency, and the spatial sampling array will determine the absorbed energy fluence per picture element (pixel) a ...
radiation protection in diagnostic radiology - RPOP
... nice images can be obtained at double the dose or more and overexposures are not obvious unlike dark images in screen-film radiography. False – Only when features are utilized, not always. See the earlier question as an example. True – Additional consideration of image quality and dose ...
... nice images can be obtained at double the dose or more and overexposures are not obvious unlike dark images in screen-film radiography. False – Only when features are utilized, not always. See the earlier question as an example. True – Additional consideration of image quality and dose ...
Including Anatomical and Functional Information in MC - DIE
... MRI. High-resolution, 3-D T1-weighted images were acquired using a Siemens Tim Trio 3T in the sagittal plane with a matrix size of 224 240 256 voxels (0.86 0.90 0.86 mm voxel size) completely covering the brain. Interictal PET-CT. PET-CT scans were performed using a hybrid PET/CT (Classic BIOGRAPH, ...
... MRI. High-resolution, 3-D T1-weighted images were acquired using a Siemens Tim Trio 3T in the sagittal plane with a matrix size of 224 240 256 voxels (0.86 0.90 0.86 mm voxel size) completely covering the brain. Interictal PET-CT. PET-CT scans were performed using a hybrid PET/CT (Classic BIOGRAPH, ...
Computer-assisted detection of infectious lung diseases: A review
... underlying pathology and clinical variables [2]. ...
... underlying pathology and clinical variables [2]. ...
Interventional dual-energy imaging—Feasibility
... angiographic C-arm system and the peak tube voltage during 3D rotational scans was measured. The tube voltage measurements during fast kV-switching scans were compared to corresponding measurements on kV-constant scans. Additionally, to prove stability of the requested exposure parameters, the accur ...
... angiographic C-arm system and the peak tube voltage during 3D rotational scans was measured. The tube voltage measurements during fast kV-switching scans were compared to corresponding measurements on kV-constant scans. Additionally, to prove stability of the requested exposure parameters, the accur ...
Nuclear medicine
Nuclear medicine is a medical specialty involving the application of radioactive substances in the diagnosis and treatment of disease. Nuclear medicine scans are usually conducted by radiographers. Nuclear medicine, in a sense, is ""radiology done inside out"" or ""endoradiology"" because it records radiation emitting from within the body rather than radiation that is generated by external sources like X-rays.