Browsing by Author "Ribeiro, Daniela"
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- Gonad dose assessment of patients undergoing pelvic radiotherapyPublication . Ribeiro, Daniela; Sá, Ana Cravo; Carolino, Elisabete; Martins, Leonor Santos; Borrego, MargaridaIntroduction: Radiotherapy can impact patients’ reproductive organs and fertility. This study aims (i) to assess whether the doses to the gonads of 70 patients met the tolerance doses used in radiotherapy planning; (ii) to compare Three-Dimensional Conformal Radiotherapy (3DCRT) with Volumetric Modulated Arc Therapy (VMAT) techniques; and (iii) to verify if ovarian transposition reduces the dose to the ovaries. Methods: A retrospective analysis of 70 patients aged 45 or under who underwent pelvic radiotherapy between 2014 and 2023 in a radiotherapy department was carried out. The dose constraints considered were derived from the Dose-Volume Constraints for Organs at Risk in Radiotherapy project. Results: The average number of children of all the patients in the study was 1.25, and the standard deviation was 1.40. No statistically significant differences were detected regarding the doses to the left and right gonads between 3DCRT and VMAT (p > 0.05). There were statistically significant differences between female patients who underwent ovarian transposition and those who did not undergo ovarian transposition regarding the maximum and median doses in both right and left ovaries (p < 0.05), with a dose reduction that could reduce doses by an average of up to 39 Gy. Conclusions: In the total sample, 58.6% of patients were treated with VMAT, only 18.6% met the maximum dose limits, and 22.9% met the average dose constraints. Only five women underwent ovarian transposition, which proved effective in meeting dose constraints and significantly reducing the dose to the ovaries.
- Influence of attenuation correction in the MPI image reconstructed by the ‘Evolution for Cardiac’™Publication . Ribeiro, Daniela; Vilaça, Joana; Nunes, Cristiano; Freire, Luís; Pinheiro, Marco; Cantinho, Guilhermina; Carolino, Elisabete; Sousa, EvaThe acquisition of a Myocardial Perfusion image (MPI) is of great importance for the diagnosis of the coronary artery disease, since it allows to evaluate which areas of the heart aren’t being properly perfused, in rest and stress situations. This exam is greatly influenced by photon attenuation which creates image artifacts and affects quantification. The acquisition of a Computerized Tomography (CT) image makes it possible to get an atomic images which can be used to perform high-quality attenuation corrections of the radiopharmaceutical distribution, in the MPI image. Studies show that by using hybrid imaging to perform diagnosis of the coronary artery disease, there is an increase on the specificity when evaluating the perfusion of the right coronary artery (RCA). Using an iterative algorithm with a resolution recovery software for the reconstruction, which balances the image quality, the administered activity and the scanning time, we aim to evaluate the influence of attenuation correction on the MPI image and the outcome in perfusion quantification and imaging quality.
- Perfil comportamental dos estudantes do ensino básico relacionado com a mochila escolarPublication . Ribeiro, Daniela; Santos, Paula Clara; Simões, Daniela; Venâncio, João; Firmino-Machado, João; Carvalhais, Alice; Ferreira, MargaridaObjetivo – Determinar e analisar o perfil comportamental dos estudantes do primeiro ciclo do ensino básico sobre o uso da mochila escolar. Método – Estudo observacional, analítico e transversal. A amostra foi constituída por 88 estudantes do 1º ciclo do ensino básico no concelho de Vila Nova de Famalicão (Portugal). Foi aplicado um questionário para avaliar o comportamento dos estudantes relativamente ao tipo, modo de transporte, organização do material escolar e peso da mochila. Resultados – Todas as mochilas apresentavam duas alças e eram reguláveis. A maioria dos estudantes de todos os anos letivos transportava a mochila de alças nos dois ombros. No geral, os estudantes do 1º ciclo distribuíam o material de forma desorganizada pelos compartimentos da mochila e colocavam o material mais pesado afastado da coluna vertebral, não se verificando diferenças significativas. O índice de proporção mostrou que os estudantes transportavam as mochilas com peso inferior a 10% do peso corporal, exceto os estudantes do 1º ano de escolaridade (p<0,05). O peso transportado nas mochilas era significativamente assimétrico durante os dias da semana e entre os níveis de escolaridade (p<0,05). Conclusões – A maioria dos estudantes do 1º ciclo transportava a mochila com as alças nos dois ombros; porém, desconheciam as características adequadas do tipo de mochila e da distribuição uniforme do material escolar. A variação da carga da mochila durante a semana entre os níveis de escolaridade era significativamente inconsistente, mostrando que o índice de proporção de carga era mais elevado no primeiro ano de escolaridade.