<?php
$options = $this->getOptions();
$element = $this->getData('element');
$value = $element->getValue();

?>

<div class="admin__field">
    <?php foreach ($options as $option): ?>
        <label class="admin__field-label">
            <input type="radio" name="<?php echo $element->getName(); ?>"
                   value="<?php echo $option['value']; ?>"
                   <?php if ($value == $option['value']): ?>checked="checked"<?php endif; ?>
            />
            <?php echo $option['label']; ?>
        </label>
    <?php endforeach; ?>
</div>