What kilovoltage values are generally used for imaging the chests of premature infants, infants, and children respectively?

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In pediatric chest imaging, technique is adjusted according to patient size: smaller bodies need less penetration and higher contrast, while larger bodies require more penetration to visualize the lungs and mediastinal structures. The commonly used progression is around 60 kV for premature infants, about 65 kV for infants, and roughly 70 kV for children. This balance helps obtain a diagnostically useful image with adequate penetration and detail while keeping the dose as low as reasonably achievable. Values lower than this can fail to penetrate larger chests or force higher mA and dose, and values much higher than this can reduce image contrast and obscure lung details.