Characterisation Of Solid Wood And Almond Gum Bonded Rhizophora Spp. Particleboard As Breast Phantom For Mri And Ct

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Date
2016-09
Authors
Ababneh, Baker (M. Tayseer) Abdallah
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Abstract
The aim of this research is to study the suitability of using natural (fresh solid wood) and fabricated Rhizophora spp. particleboard as a breast phantom for MRI and CT application. The relaxation times T1 and T2, CT numbers and density for the fresh Rhizophora spp., with three different MC percentages (33%, 24% and 16%) were determined using an MRI and CT scan respectively, to be a suitable phantom for a breast, as they have similar relaxation time to soft tissue of the breast. The relaxation times of 33% and 24% were very close to the soft tissue value, particularly breast tissue. In addition, the CT numbers and density of samples in the same range of soft tissue. Then, almond gum bonded Rhizophora spp. particleboard were fabricated with three particle sizes (425 - 210 μm, 210 - 74 μm, and < 74 μm) at three different almond gum adhesive levels of 0%, 8%, and 16%, to see if they could be used as a suitable breast phantom via an MRI and CT application. The CT numbers, density, mechanical and physical properties, characterization and attenuation properties were found to indicate what particleboard samples are most suitable to fabricate breast phantoms. Based on, the results of this study, using almond gum as a bio adhesive bonded with Rhizophora spp. particleboard achieves a noticeable improvement in the physical and mechanical characteristics. For attenuation properties, it was found that the particleboard fabrication close from the water and young - age (Breast 1) tissue calculated value by XCOM computer program. The particleboard samples with the optimum properties were used for the fabrication of a semicircular breast phantom with a size of 16 × 8 × 8 cm (L × H × T). Perspex breast phantoms were also used in this study with the same size and shape as the particleboard phantom. The MRI and CT scan indicated good agreement between the data of the fabricated Rhizophora spp. particleboard and that of the Perspex breast phantom, where the CT numbers range from -6.29 to 28.57 HU and 102.43 to 116 HU, and the density 1.03g/cm3, 1.14g/cm3, respectively. The uniformity values for two selected phantoms fall within the advised limit of ≤ 5 HU, which 4.32 HU and 1.07 HU also, the noise of Rhizophora spp. particleboard and Perspex breast phantoms are 4.91 and 2.71 respectively. The 4 tubes water inside the simulated phantoms were clearly seen and precisely localized in the MRI and CT images of the two breast phantoms. Two of fabricated breast phantoms appeared with similar grayscale distribution in the CT images, which indicated the uniform density and homogenous composition. The quantification value from the MRI image measurements, were the p - value measurement for particleboard breast phantoms between T1 and T2 weighted image it found 0.066 non significant and equal 0.232 significant for Perspex breast phantom. Also, the ghosting values of two phantoms achieved the required value should be less than or equal to 0.025. Based on the above results, Rhizophora spp. particleboard bonded almond gum can be highly recommended as a material of tissue equivalent phantom for CT applications and can be considered open new window to doing more study to be possible for use as a reference in MRI phantoms and other radiological areas.
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The suitability of using natural (fresh solid wood) and fabricated Rhizophora spp. particleboard , as a breast phantom for MRI and CT application.
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