Differential and Integral Calculus by Feliciano and 73: A Rigorous and Intuitive Introduction to Cal

Barbosa, Eliene (2019). The differential and integral calculus as a professional knowledge in the training of the graduate in mathematics of the faculty of philosophy of bahia (1942-1968). Acta Scientiae. Revista de Ensino de Ciências e Matemática, 21, pp. 78-91 .

To evaluate the accuracy of reduced-dose abdominal computed tomographic (CT) imaging by using a new generation model-based iterative reconstruction (MBIR) to diagnose acute renal colic compared with a standard-dose abdominal CT with 50% adaptive statistical iterative reconstruction (ASIR). This institutional review board-approved prospective study included 118 patients with symptoms of acute renal colic who underwent the following two successive CT examinations: standard-dose ASIR 50% and reduced-dose MBIR. Two radiologists independently reviewed both CT examinations for presence or absence of renal calculi, differential diagnoses, and associated abnormalities. The imaging findings, radiation dose estimates, and image quality of the two CT reconstruction methods were compared. Concordance was evaluated by κ coefficient, and descriptive statistics and t test were used for statistical analysis. Intraobserver correlation was 100% for the diagnosis of renal calculi (κ = 1). Renal calculus (τ = 98.7%; κ = 0.97) and obstructive upper urinary tract disease (τ = 98.16%; κ = 0.95) were detected, and differential or alternative diagnosis was performed (τ = 98.87% κ = 0.95). MBIR allowed a dose reduction of 84% versus standard-dose ASIR 50% (mean volume CT dose index, 1.7 mGy 0.8 [standard deviation] vs 10.9 mGy 4.6; mean size-specific dose estimate, 2.2 mGy 0.7 vs 13.7 mGy 3.9; P

differential and integral calculus by feliciano and 73

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