two new potential magnetic resonance imaging contrast agents, gd-hematoporphyrin (gd-h) and gd-tetra-carboranylmethoxyphenyl-porphyrin (gd tcp), were synthesized and applied to nude mice with human melanoma (mm 138) xenografts. these agents showed a high relaxivity because of their greater potential to coordinate water molecules. the reduction of t1 relaxation times of 16 and 21% was observed i...

purpose: to image leukocyte adherence to the vascular endothelium and extravasation into surrounding tissues in neovascularized corneas using acridine orange, a selective dna stain, in rats methods: corneal neovascularization was induced by placing two sutures in the cornea of one eye of 12 long-evans rats. one week later, acridine orange (4 mg/kg) was injected via the tail vein and the eyes we...

objective: behavioral disorders of children and adolescents have long been a subject of discussion among researchers of pedology,   psychology, medicine and psychiatry and are also a commonly encountered complaint of patients referring to the pediatric neurology out patient clinics. the main purpose of the present study is to survey some organic disorders, e.g. temporal lobe epilepsy (non convu...

introduction: the use of high-cost and high-tech magnetic resonance imaging (mri) has expanded over the past decade. a recently conducted research reported various causes with regard to their own country and healthcare system included aging population and advances in diagnostic technologies which could result in diagnostic services to become more applicable in clinical arena. increasing number ...

cerebral palsy is the most common chronic motor disorder of childhood, that affecting approximately 3 infants per 1000 live-births. the risk of brain injuries that potentially cause cerebral palsy has amplified with increasing in survival rates for preterm infants. in addition cerebral palsy has a huge economic impact, to immeasurable health, social, and psychological problems that affected chi...

This paper intends to compare the abilities of the two major imaging modalities in nuclear medicine imaging: Positron Emission Tomography (PET) and Single Photon Emission Computed Tomography (SPECT). The motivations are many-fold: (i) To gain a better understanding of the strengths and limitations of the two imaging modalities in the context of recent and ongoing developments in hardware ...

conclusions small size, smooth lesion border and homogeneity favor benign nature of the incidental splenic lesions, while restricted diffusion might be a feature of malignancy. follow-up imaging might be helpful in a subset of patients to discriminate benign and malignant incidental splenic lesions. methods this retrospective study was performed in a tertiary referral center. data of patients w...

basic physical principles of nuclear magnetic resonance imaging (n.m.r.i), a nonionizing medical imaging technique, are described. principles of nmri with other conventional imaging methods, ie, isotope scanning, ultrasonography and radiography have been compared. t1 and t2 and spin density (s.d.) factors and different image construction techniques based on their different combinations is discu...

polarimetric synthetic aperture radar (pol.-sar) allows us to implement the recognition and classification of radar targets. this article investigates the arrangement of scatterers by sar data and proposes a new look-up table of region (ltr). this look-up table is based on the combination of (entropy h/anisotropy a) and (anisotropy a/scattering mechanism α), which has not been reported up now. ...

Tc-99m MIBI has recently been used in the functional imaging of various tumors. This prospective study was performed to evaluate the role of Tc-99m MIBI imaging at the time of the initial staging, assessment of treatment response, follow-up studies and survaillance in Hodgkin’s and non-Hodgkin’s Iymphoma. 25 patients (14 with Hodgkin’s and 11 with non-Hodgkin’s Iymphoma) underwent 32 stud...