Ambient dose during intra-oral radiography with current techniques: Part 2 quantifying the remnant beam - an <i>in vivo </i>study

Objectives: This study was conducted to assess the impact of tube voltage on ambient dose during intraoral radiography, specifically remnant-beam transmission and scattered radiation. Methods and materials: Remnant-beam and scattered radiation doses were recorded using a phantom at tube voltages of 60, 63, 66, and 70 kV. Mathematical equations depicting their relations were then formulated, and reference values were calculated at the various voltages tested. Total ambient doses per exposure at 60 kV and at 70 kV were compared. Results: Both remnant-beam transmission and scattered radiation increased ~40% by increasing tube voltage from 60 kV to 70 kV, and the relation was linear. A remnant beam transmission reference value of 7.5% was established at 70 kV, as well as a conversion factor of 0.035µSv/mAs at one meter for scattered radiation at 60 kV. Given longer exposure times at 60 kV, total ambient dose proved higher at 60 kV than at 70 kV. Conclusion: Higher tube voltage results in higher remnant-beam transmission and more scattered radiation per workload. The relation is linear in the range between 60kV and 70 kV. Remnant-beam transmission at 70 kV is safely assessed at 7.5%. A conversion factor at 60 kV of 0.035 µSv/mAs at one meter for the scattered radiation dose can be proposed. Total ambient dose per exposure was higher at 60kV than at 70 kV.

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Ambient dose during intraoral radiography with current techniques: part 3: effect of tube voltage

Hoogeveen

Beest

Berkhout

2021

Dentomaxillofacial Radiology

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Ambient dose during intra-oral radiography with current techniques: Part 2 quantifying the remnant beam - an in vivo study

Abstract: A transmission factor of 5% could be used to assess the remnant beam during intra-oral radiography. Anterior exposures led to significantly lower transmission values than posterior exposures.

Cited by 1 publication

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Ambient dose during intraoral radiography with current techniques: part 3: effect of tube voltage

Ambient dose during intraoral radiography with current techniques: part 3: effect of tube voltage

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