Carlos Marin - Academia.edu (original) (raw)
Papers by Carlos Marin
Skeletal Radiology, 2003
Only three cases of scapular duplication have been described in English in the literature. We rep... more Only three cases of scapular duplication have been described in English in the literature. We report a case of a child with duplication of the right scapula, operated on at our center with good results.
Current Problems in Diagnostic Radiology, 2004
Magnetic resonance imaging has become a common tool for the diagnosis and management of osteoarti... more Magnetic resonance imaging has become a common tool for the diagnosis and management of osteoarticular infections in children. We retrospectively review the MRI findings in 57 children (age range 4 months to 16 years; mean 6.3 years) diagnosed with osteoarticular infection. Thirty-eight cases were osteomyelitis, 4 were septic arthritis, 6 were spondylodiscitis, 7 were soft-tissue infections, 2 were pyomyositis, and 2 were chronic multifocal osteomyelitis. The pathogenesis and classification of osteoarticular infections are briefly discussed. Currently available imaging techniques are reviewed, and advantages and disadvantages are discussed. Magnetic resonance imaging indications and findings are shown. The most adequate magnetic resonance imaging sequences, as well as the usefulness of intravenous contrast material, are stressed.
Pediatric Radiology, 2008
We report the MRI findings in a 3-week-old boy with D-transposition of the great arteries and an ... more We report the MRI findings in a 3-week-old boy with D-transposition of the great arteries and an abnormal origin of the right subclavian artery from the pulmonary artery. This anomaly of the subclavian arteries is called isolation. It is infrequent in patients with a right aortic arch, but exceedingly rare in those with a left aortic arch. This is a unique report of the MRI findings in this congenital abnormality of the aortic arch.
European Radiology, 2002
Although uterus and cervix infiltration is a frequent finding in the later stages of lymphomatous... more Although uterus and cervix infiltration is a frequent finding in the later stages of lymphomatous disease, primary lymphoma of the cervix is very uncommon; however, this entity can occasionally be distinguished from cervical carcinoma by means of MRI. This is an important fact as treatment and prognosis differ between these neoplasms. We present a case of primary cervical lymphoma studied with high-field (1.5 T) MRI and we make an extensive review of the literature. The cervical mass was found in a routine pelvic examination in a patient with no previous history of gynecologic disorders. This is an uncommon way of presentation of this disease. T2-weighted turbo spin-echo (TSE) sequences in the axial, sagittal, and coronal planes, and T1-weighted SE pre- and post-contrast images, were obtained. The lack of involvement of the mucosa, as well as sparing of cervical stroma and uterine junctional zone, are the most important findings to differentiate cervical lymphoma from carcinoma, and are best evaluated with T2 TSE sequences. Post-contrast images help to delineate the extent of the disease.
Water Resources Research, 1991
Many geophysical properties can be described as spatial stochastic processes, including spatially... more Many geophysical properties can be described as spatial stochastic processes, including spatially correlated hydraulic conductivity fields. Use of regional data can potentially improve estimation of such processes. We consider the case in which observations at each of several sites are described by a general linear model, while the parameters of these models arise from a common regional distribution. Parametric empirical Bayes methods enable the determination of the parameters of the regional distribution via maximum likelihood. However, such methods have not been utilized for spatial stochastic processes. We develop the application of a simple iterative technique for maximum likelihood estimation of the regional parameters, and demonstrate its use with a common parameterization of the spatial covariance structure. Synthetic data tests show the potential for substantial reduction in estimation risk through use of such techniques.
Journal of The American Water Resources Association, 1985
Models for pollutant runoff can be useful in water quality management planning if appropriately s... more Models for pollutant runoff can be useful in water quality management planning if appropriately structured for the problem at hand. Accordingly, a “top-down” approach is proposed for the examination of extant pollutant runoff models. The approach consists of the identification of objectives and attributes that reflect the needs of planners and decision makers when these models are used for water quality management planning. Ideally, the attributes should concern the effect of model information on improved decision making and the cost of model application. Practical difficulties with the first attribute necessitates substitution of surrogate attributes reflecting model appropriateness, resolution, and uncertainty. Common pollutant runoff models, in particular export coefficients and hydrology-driven simulation models, are found to have serious weaknesses on some of the attribute scales. The “top-down” approach leads to a set of desirable pollutant runoff model attributes; alternate modeling techniques are thus examined in order to identify promising future directions for model development. The focus of this examination is phosphorus, due to its importance in the eutrophication of surface waters. Models for both sediment-attached and dissolved phosphorus are considered. Among the conclusions is the belief that the partial contributing area concept can yield an effective yet simple simulation despite the variable and complex nature of runoff.
Skeletal Radiology, 2003
Only three cases of scapular duplication have been described in English in the literature. We rep... more Only three cases of scapular duplication have been described in English in the literature. We report a case of a child with duplication of the right scapula, operated on at our center with good results.
Current Problems in Diagnostic Radiology, 2004
Magnetic resonance imaging has become a common tool for the diagnosis and management of osteoarti... more Magnetic resonance imaging has become a common tool for the diagnosis and management of osteoarticular infections in children. We retrospectively review the MRI findings in 57 children (age range 4 months to 16 years; mean 6.3 years) diagnosed with osteoarticular infection. Thirty-eight cases were osteomyelitis, 4 were septic arthritis, 6 were spondylodiscitis, 7 were soft-tissue infections, 2 were pyomyositis, and 2 were chronic multifocal osteomyelitis. The pathogenesis and classification of osteoarticular infections are briefly discussed. Currently available imaging techniques are reviewed, and advantages and disadvantages are discussed. Magnetic resonance imaging indications and findings are shown. The most adequate magnetic resonance imaging sequences, as well as the usefulness of intravenous contrast material, are stressed.
Pediatric Radiology, 2008
We report the MRI findings in a 3-week-old boy with D-transposition of the great arteries and an ... more We report the MRI findings in a 3-week-old boy with D-transposition of the great arteries and an abnormal origin of the right subclavian artery from the pulmonary artery. This anomaly of the subclavian arteries is called isolation. It is infrequent in patients with a right aortic arch, but exceedingly rare in those with a left aortic arch. This is a unique report of the MRI findings in this congenital abnormality of the aortic arch.
European Radiology, 2002
Although uterus and cervix infiltration is a frequent finding in the later stages of lymphomatous... more Although uterus and cervix infiltration is a frequent finding in the later stages of lymphomatous disease, primary lymphoma of the cervix is very uncommon; however, this entity can occasionally be distinguished from cervical carcinoma by means of MRI. This is an important fact as treatment and prognosis differ between these neoplasms. We present a case of primary cervical lymphoma studied with high-field (1.5 T) MRI and we make an extensive review of the literature. The cervical mass was found in a routine pelvic examination in a patient with no previous history of gynecologic disorders. This is an uncommon way of presentation of this disease. T2-weighted turbo spin-echo (TSE) sequences in the axial, sagittal, and coronal planes, and T1-weighted SE pre- and post-contrast images, were obtained. The lack of involvement of the mucosa, as well as sparing of cervical stroma and uterine junctional zone, are the most important findings to differentiate cervical lymphoma from carcinoma, and are best evaluated with T2 TSE sequences. Post-contrast images help to delineate the extent of the disease.
Water Resources Research, 1991
Many geophysical properties can be described as spatial stochastic processes, including spatially... more Many geophysical properties can be described as spatial stochastic processes, including spatially correlated hydraulic conductivity fields. Use of regional data can potentially improve estimation of such processes. We consider the case in which observations at each of several sites are described by a general linear model, while the parameters of these models arise from a common regional distribution. Parametric empirical Bayes methods enable the determination of the parameters of the regional distribution via maximum likelihood. However, such methods have not been utilized for spatial stochastic processes. We develop the application of a simple iterative technique for maximum likelihood estimation of the regional parameters, and demonstrate its use with a common parameterization of the spatial covariance structure. Synthetic data tests show the potential for substantial reduction in estimation risk through use of such techniques.
Journal of The American Water Resources Association, 1985
Models for pollutant runoff can be useful in water quality management planning if appropriately s... more Models for pollutant runoff can be useful in water quality management planning if appropriately structured for the problem at hand. Accordingly, a “top-down” approach is proposed for the examination of extant pollutant runoff models. The approach consists of the identification of objectives and attributes that reflect the needs of planners and decision makers when these models are used for water quality management planning. Ideally, the attributes should concern the effect of model information on improved decision making and the cost of model application. Practical difficulties with the first attribute necessitates substitution of surrogate attributes reflecting model appropriateness, resolution, and uncertainty. Common pollutant runoff models, in particular export coefficients and hydrology-driven simulation models, are found to have serious weaknesses on some of the attribute scales. The “top-down” approach leads to a set of desirable pollutant runoff model attributes; alternate modeling techniques are thus examined in order to identify promising future directions for model development. The focus of this examination is phosphorus, due to its importance in the eutrophication of surface waters. Models for both sediment-attached and dissolved phosphorus are considered. Among the conclusions is the belief that the partial contributing area concept can yield an effective yet simple simulation despite the variable and complex nature of runoff.