Medical knowledge on ionizing radiations

Carvalho, Antônio Carlos Pires

doi:10.1590/s0100-39842014000200004

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…As comments Dr. Carvalho, A.C.P. (15) , based on large teaching experience, "sometimes unnecessary imaging studies are frequently requested because the assisting physician does not have in mind that the radiation dose delivered by a chest CT scan corresponds to the dose delivered by approximately 200 to 500 chest radiographies, not to mention the much higher cost of computed tomography. "…”

Section: Discussionmentioning

confidence: 99%

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CTDI versus New AAPM Metrics to assess Doses in CT: a case study

2016

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In modern CT, CTDI100 measurements would underestimate accumulated dose at the gantry center. AAPM TG 111 report proposed improved metrics for CT dosimetry, mainly for helical and wide beam width scanning. In this study, a methodology to assess CT dose, inspired on TG 111, was applied. Dosimeters were firstly calibrated in lab in beams like those utilized clinically. Using a reference 0.6cc Farmer chamber, two CT "pencil" chambers were calibrated in PKL by substitution method. Results showed differences ≤ 2% in the calibration coefficients, for three collimation apertures. A small 0.6cc chamber was calibrated in air kerma with this setup, without any collimator. After this, in a private Brazilian hospital, the small chamber was applied in dosimetry tests of a CT scanner, according to TG 111, determining Dose profiles and Equilibrium dose free-in-air (Deq,air) for some protocols and pitch values. Results showed that Deq,air increased when reducing pitch and Equilibrium dose-pitch product free in air (p.Deq,air) remain constant. In measurements with a 450mm CT phantom, differences between Planar Average Equilibrium Dose (Deq,p) and CTDIvol ranged between 30-37%. This occurs because CTDIvol cannot include dose profile "tail" contribution, caused by scattering in phantom, especially for wide beam widths.

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Section: Discussionmentioning

confidence: 99%

“…After all, we tend to agree with him, when he conclude that, "it is necessary to rethink the curricular reforms, the modern pedagogy, distance teaching and learning, the internet, the tablets, and seriously thinking of resuming the education of physicians enabling them to care for human beings." (15)…”

Section: Discussionmentioning

confidence: 99%

CTDI versus New AAPM Metrics to assess Doses in CT: a case study

2016

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“…Thoracic diseases of vascular origin have been the subject of a number of recent publications in the radiology literature of Brazil ( 1 - 5 ) . First described by Fioratti et al, right aortic arch is an uncommon birth defect, of unknown cause, occurring in 0.05% of the general population.…”

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confidence: 99%

Aortic arch anomaly in an adult patient: a case of right aortic arch with aberrant left subclavian artery and Kommerell's diverticulum

Silva¹,

Santos

2016

Radiol Bras

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Medical knowledge on ionizing radiations

Cited by 2 publications

References 3 publications

CTDI versus New AAPM Metrics to assess Doses in CT: a case study

CTDI versus New AAPM Metrics to assess Doses in CT: a case study

Aortic arch anomaly in an adult patient: a case of right aortic arch with aberrant left subclavian artery and Kommerell's diverticulum

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