Sökning: "intracranial tumors"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden intracranial tumors.

1. 1. Applications of diffusion MRI: Tensor-valued encoding, time-dependent diffusion, and histological validation

   Författare :Jan Brabec; Lund Medicinsk strålningsfysik; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; diffusion MRI; meningioma; glioma; brain tumors; intracranial tumors; undulations; restricted diffusion; time dependence; spherical b-tensor encoding; linear b-tensor encoding; histogram analysis; anisotropic kurtosis; isotropic kurtosis; hyperintensity; conspicuity; white matter; detection; diffusion spectrum; consistency; type; grade; axon diameter; axonal trajectories; Fysicumarkivet A:2022:Brabec;

   Sammanfattning : Diffusion MRI (dMRI) sensitizes the MR signal to the diffusion of water molecules at the microscopic level and thereby non-invasively probes tissue microstructure. This is relevant when determining biological properties of tissues, for example, cancer type and its malignancy. LÄS MER

3. 2. Mobile phone use and risk of intracranial tumors

   Författare :Stefan Lönn; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Acoustic neuroma; brain tumor; case-control study; epidemiology; intracranial tumor; mobile phone; radiofrequency radiation;

   Sammanfattning : Mobile phones are today an integral part of many people's lives in western societies. The phones emit radiofrequency radiation when being used. Concerns have been raised about possible effects that the exposure may have on the health of the mobile phone user. LÄS MER

4. 3. Genes and brain tumors

   Författare :Maral Adel Fahmideh; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Although brain tumors are rare and combined with other nervous system tumors account for ~ 2% of all cancers, they are the second most common type of pediatric cancer. The etiology of brain tumors, known as multifactorial traits, is poorly understood. LÄS MER

5. 4. Genotype-phenotype studies in brain tumors

   Författare :Soma Ghasimi; Ulrika Andersson; Beatrice Melin; Roger Henriksson; Clemens Dirven; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Glioma; Meningioma; SNP; IHC; FISH; LRIG2; EGF; EGFR; ERBB2; ER; CDKN2A B; IDH1; onkologi; Oncology;

   Sammanfattning : Meningioma and glioma are the most common primary brain tumors, but their etiologies are largely unknown. Although meningioma is usually benign, their intracranial location can lead to lethal consequences, and despite progress in surgery, radiotherapy, and chemotherapy the prognosis for patients with glioma remains poor. LÄS MER

7. 5. MRI at 3 T of brain functions and fibre tracts adjacent to intracranial tumors

   Författare :Danielle van Westen; Lund Diagnostisk radiologi; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; medical instrumentation; Klinisk fysiologi; radiologi; tomografi; medicinsk instrumentering; radiology; tomography; Clinical physics; Medicin människa och djur ; Medicine human and vertebrates ; somatosensory cortex; diffusion magnetic resonance imaging; neoplasms; Functional Magnetic Resonance Imaging;

   Sammanfattning : The aims of the studies were: to evaluate the spatial resolution of fMRI at 3 T by studying fingersomatotopy in area 3 b of the primary sensory area (Paper 1); to investigate the potential of fMRI at 3T as a clinical tool for preoperative evaluation of patients with intracranial tumors (Paper 2); to investigate the effect of glioma resection on the spatial extent of fMRI activation as compared to the normal within-subject variability (Paper 3); to determine whether the apparent diffusion coefficient (ADC) and fractional anisotropy (FA) can distinguish tumor-infiltrated edema of gliomas from pure edema of meningiomas and metastases (Paper 4). Results: Strict somatotopic organisation in the primary sensory cortex was shown in the group average; at the subject level the thumb was located laterally, anteriorly and inferiorly to the little finger in 94 % of subjects (Paper 1). LÄS MER