Optimization of standard patient radiographic images for chest, skull and pelvis exams in conventional x-ray equipment

Pina, Diana Rodrigues de; Duarte, S. B.; Netto, Thomaz Ghilardi; Trad, Clóvis Simão; Brochi, Marco A C; Oliveira, Susana Cristina

doi:10.1088/0031-9155/49/14/n02

Cited by 19 publications

(10 citation statements)

References 16 publications

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“…The homogeneous portion of this phantom was utilized for selection of X-ray beam exposure parameters (10,11) , in a way to obtain radiographic techniques responsible for the yielding of an OD satisfactory to the human eye. The optical densities originated from sensitometric curves produced by the time scale sensitometric method (10)(11)(12) .…”

Section: Methodsmentioning

confidence: 99%

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Otimização de imagens mamográficas

Pina¹,

Morceli²,

Duarte

et al. 2006

Radiol Bras

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OBJECTIVE: The aim of this study is the optimization of mammographic images with a considerable radiation dose reduction. MATERIALS AND METHODS: In the present study the X-ray beam was calibrated for each tension (kVp), aiming at determining the best combination between kVp and mAs, resulting in optical densities of about 1.0 above the base-plus-fog density. RESULTS: This study will bring into question the methods for X-ray beam calibration, the choice of the best image by means of visual grading analysis, comparisons between doses and tube load (kVp × mAs) delivered by the techniques described in this study and by those adopted in the clinical routine at Service of Diagnostic Imaging of Faculdade de Medicina de Botucatu Clinics Hospital, Botucatu, SP, Brazil. Excellent breast radiographic images have been obtained with doses and tube loads reduction of respectively 36.8% and 46.2% in comparison to those employed in our institutions' clinical routine. CONCLUSION: This study is a contribution to the optimization of the risk-benefit ratio for patients and cost-benefit ratio for the institution. Keywords: Mammography; Homogeneous phantom; Quality control; Dose reduction.Otimização de imagens mamográficas. OBJETIVO: Este trabalho tem como objetivo a otimização de imagens mamográficas, com consideráveis reduções de doses. MATERIAIS E MÉTODOS: Neste estudo o feixe de raios-X foi calibrado para cada tensão (kVp), de modo a determinar a melhor combinação de kVp e mAs que irá proporcionar uma densidade ótica (DO) em torno de 1.0 acima da base mais véu do filme utilizado. RESULTADOS: Serão discutidas questões sobre os métodos empregados para a seleção de parâmetros de exposição do feixe de raios-X, seleção da melhor imagem utilizando o método de avaliação gradativa visual, comparações entre as doses e carga do tubo (kVp × mAs) proporcionadas pelas técnicas determinadas neste estudo e pelas utilizadas na rotina clí-nica do Serviço de Diagnóstico por Imagem do Hospital das Clínicas da Faculdade de Medicina de Botucatu. Neste estudo foram obtidas imagens radiográficas de mama de excelente qualidade, com redução de dose e carga de tubo, respectivamente, de 36,8% e 46,2%, quando comparadas com a técnica utilizada pela rotina clínica da instituição. CONCLUSÃO: Esta pesquisa vem contribuir com a otimização da relação riscobenefício para o paciente e custo-benefício para a instituição. Unitermos: Mamografia; Fantoma homogêneo; Controle de qualidade; Redução de dose. AbstractResumo

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Section: Methodsmentioning

confidence: 99%

“…The optical densities originated from sensitometric curves produced by the time scale sensitometric method (10)(11)(12) . This is a very efficient method for experiments in radiodiagnosis .…”

Section: Methodsmentioning

confidence: 99%

Otimização de imagens mamográficas

Pina¹,

Morceli²,

Duarte

et al. 2006

Radiol Bras

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“…Previous studies [10][11][12][13] have considered the average bone density for cortical and trabecular layers of bone. Other studies have used aluminium as a material in order to simulate bone [4,5,[14][15][16]. However, these studies produced phantoms which lacked the geometrical representation necessary for IQ evaluation studies.…”

Section: -Introductionmentioning

confidence: 99%

Construction and validation of a low cost paediatric pelvis phantom

Ali

Hogg

Johansen

et al. 2018

European Journal of Radiology

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PURPOSE: Imaging phantoms can be cost prohibitive, therefore a need exists to produce low cost alternatives which are fit for purpose. This paper describes the development and validation of a low cost paediatric pelvis phantom based on the anatomy of a 5-year-old child. METHODS: Tissue equivalent materials representing paediatric bone (Plaster of Paris; PoP) and soft tissue (Poly methyl methacrylate; PMMA) were used. PMMA was machined to match the bony anatomy identified from a CT scan of a 5-year-old child and cavities were created for infusing the PoP. Phantom validation comprised physical and visual measures. Physical included CT density comparison between a CT scan of a 5-year old child and the phantom and Signal to Noise Ratio (SNR) comparative analysis of anteroposterior phantom X-ray images against a commercial anthropomorphic phantom. Visual analysis using a psychometric image quality scale (face validity). RESULTS: CT density, the percentage difference between cortical bone, soft tissue and their equivalent tissue substitutes were-4.7 to-4.1% and-23.4%, respectively. For SNR, (mAs response) there was a strong positive correlation between the two phantoms (r>0.95 for all kVps). For kVp response, there was a strong positive correlation between 1 and 8 mAs (r=0.85), this then decreased as mAs increased (r=-0.21 at 20 mAs). Psychometric scale results produced a Cronbach's Alpha of almost 0.8. CONCLUSIONS: Physical and visual measures suggest our low-cost phantom has suitable anatomical characteristics for X-ray imaging. Our phantom could have utility in dose and image quality optimisation studies.

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“…Homogeneous phantoms are important tools to establish optimized techniques [6][7][8][9], especially in medical departments with restricted resources, which can easily simulate realistic anatomical regions [10]. Two homogeneous phantoms are currently used: LucAl phantom (which provides accurate simulation of primary and scatter transmission through the lung field) [11] and patient equivalent phantom (PEP; also known as the ANSI phantom [6,10,12] for the chest, skull, and extremities).…”

Section: Introductionmentioning

confidence: 99%