In vitro and in vivo MR evaluation of internal gradient to assess trabecular bone density
| Autor: | Mauro Rebuzzi, Bruno Maraviglia, Fabrizio Fasano, Silvia Capuani, S. De Santis, G Di Pietro |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Adult
Male Pathology medicine.medical_specialty bone marrow Bone density bone Diffusion Young Adult Femoral head Bone Density In vivo medicine Animals Humans Radiology Nuclear Medicine and imaging Aged Radiological and Ultrasound Technology medicine.diagnostic_test Chemistry internal gradient Reproducibility of Results Femur Head Magnetic resonance imaging Boundary zone Middle Aged Magnetic Resonance Imaging In vitro Trabecular bone medicine.anatomical_structure Osteoporosis Bone marrow Biomedical engineering |
| Zdroj: | Physics in medicine and biology 55 (2010): 5767. doi:10.1088/0031-9155/55/19/010 info:cnr-pdr/source/autori:De Santis, S.; Rebuzzi, M.; Di Pietro, G.; Fasano, F.; Maraviglia, B.; Capuani, S./titolo:In vitro and in vivo MR evaluation of internal gradient to assess trabecular bone density/doi:10.1088%2F0031-9155%2F55%2F19%2F010/rivista:Physics in medicine and biology (Print)/anno:2010/pagina_da:5767/pagina_a:/intervallo_pagine:5767/volume:55 |
| DOI: | 10.1088/0031-9155/55/19/010 |
| Popis: | Here we propose a new magnetic resonance (MR) strategy based on the evaluation of internal gradient (G(i)) to assess the trabecular bone (TB) density in spongy bone. Spongy bone is a porous system characterized by a solid trabecular network immersed in bone marrow and characterized by a different relative percentage of water and fats. Using a 9.4 T MR micro-imaging system, we first evaluated the relative water and fat G(i) as extracted from the Spin-Echo decay function in vitro of femoral head samples from calves. Indeed, the differential effects of fat and water diffusion result in different types of G(i) behavior. Using a clinical MR 3T scanner, we then investigated in vivo the calcanei of individuals characterized by different known TB densities. We demonstrate, on these samples, that water is more prevalent in the boundary zone, while fats are rearranged primarily in the central zone of each pore. In vitro experiments showed that water G(i) magnitude from the samples was directly proportional to their TB density. Similar behavior was also observed in the clinical measures. Conversely, fat G(i) did not provide any information on spongy-bone density. Our results suggest that water G(i) may be a reliable marker to assess the status of spongy bone. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|