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Abstract(s)
Objetivos: Avaliar a performance da técnica de Compressed Sense em imagens de RM relativamente à variação nos tempos de aquisição das diferentes sequências utilizadas nos protocolos de RM destinados a estudar 3 regiões anatómicas (crânio, joelho e coluna lombar). Métodos: Foi elaborada uma análise numérica dos parâmetros de tempo (tempo de scan, tempo necessário para o processamento de imagem e tempo de aquisição total) em 18 sequências para praticamente todos os contrastes de imagem e para sequências 2D e 3D com o uso da técnica Compressed Sense utilizando como grupo de controle sequências sem a técnica referida. A recolha de dados, sistematização, anonimização e tratamento estatístico realizou-se no período compreendido entre fevereiro de 2022 a abril de 2022 e todas as imagens e registos foram exclusivamente obtidos através de um scanner Ingenia Elition MR (Philips Healthcare) de 3 T. A análise estatística envolveu medidas de estatística descritiva e inferencial, com valores considerados significativos para p < 0,05. Resultados: A utilização da técnica Compressed Sense permitiu reduzir o tempo total por exame (crânio, joelho e coluna lombar), respetivamente,26%, 17% e 14%, obtendo-se uma aceleração média de 19%, no conjunto dos exames realizados no estudo. Por tipo de sequência, foi obtida uma aceleração média de 29% para as sequências híbridas 3D e de 15% para sequências 2D. Conclusões: A técnica de Compressed Sense permitiu uma aceleração significativa dos exames em RM para as 3 regiões anatómicas em estudo sem alteração assinalável na qualidade de imagem.
ABSTRACT - Objectives: To evaluate the performance of the Compressed Sense technique on MRI images, regarding the variation in the acquisition times of the different sequences, using MRI protocols in 3 different anatomical regions (cranium, knee, and lumbar spine). Methods: A numerical analysis of the time parameters (scan time, time required in image processing, and total acquisition time), was elaborated in 18 sequences for practically all image contrasts as well as for 2D and 3D sequences using the Compressed Sense technique, using sequences without acquisition of the referred technique as a control group. Data collection, systematization, anonymization, and statistical treatment took place in the period from February 2022 to April 2022 and all images and records were exclusively obtained through a 3-Tesla Ingenia Elition MR (Philips Healthcare) scanner. Statistical analysis involved measures of descriptive statistics and inferential statistics, with values considered significant for p < 0.05. Results: The total time gains per exam (cranium, knee, and lumbar spine) were 26%, 17%, and 14%, respectively, obtaining an average acceleration of 19%, in the set of tests performed in the study, after the introduction of the Compressed Sense technique. In the use of 3D hybrid sequences, an average acceleration of 29% was obtained and for 2D sequences, the average acceleration was 15%. Conclusions: Compressed Sense allowed a significant acceleration of MRI examinations for the 3 anatomical regions under study without significant change in image quality.
ABSTRACT - Objectives: To evaluate the performance of the Compressed Sense technique on MRI images, regarding the variation in the acquisition times of the different sequences, using MRI protocols in 3 different anatomical regions (cranium, knee, and lumbar spine). Methods: A numerical analysis of the time parameters (scan time, time required in image processing, and total acquisition time), was elaborated in 18 sequences for practically all image contrasts as well as for 2D and 3D sequences using the Compressed Sense technique, using sequences without acquisition of the referred technique as a control group. Data collection, systematization, anonymization, and statistical treatment took place in the period from February 2022 to April 2022 and all images and records were exclusively obtained through a 3-Tesla Ingenia Elition MR (Philips Healthcare) scanner. Statistical analysis involved measures of descriptive statistics and inferential statistics, with values considered significant for p < 0.05. Results: The total time gains per exam (cranium, knee, and lumbar spine) were 26%, 17%, and 14%, respectively, obtaining an average acceleration of 19%, in the set of tests performed in the study, after the introduction of the Compressed Sense technique. In the use of 3D hybrid sequences, an average acceleration of 29% was obtained and for 2D sequences, the average acceleration was 15%. Conclusions: Compressed Sense allowed a significant acceleration of MRI examinations for the 3 anatomical regions under study without significant change in image quality.
Description
Mestrado em Radiações Aplicadas às Tecnologias da Saúde - Área de especialização: Imagem por Ressonância Magnética
Keywords
Ressonância magnética Imagem médica Compressed sense Tempo de aquisição 3D Qualidade de imagem Magnetic resonance Medical imagiology Acquisition time Image quality
Citation
Pereira DB. Avaliação da técnica de compressed sense em imagens de ressonância magnética [dissertation]. Lisboa: Escola Superior de Tecnologia da Saúde de Lisboa/Instituto Politécnico de Lisboa; 2022.
Publisher
Instituto Politécnico de Lisboa, Escola Superior de Tecnologia da Saúde de Lisboa