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The measurement of fetal head circumference (HC) is performed throughout the pregnancy to monitor fetus growth using ultrasound (US) images. Recently, methods that directly predict biometric from images, instead of resorting to segmentation, have emerged. In our previous work, we have proposed such method, based on a regression convolutional neural network (CNN). If deep learning methods are the gold standard in most image processing tasks, they are often considered as black boxes and fail to provide interpretable decisions. In this paper, we investigate various saliency maps methods, to leverage their ability at explaining the predicted value of the regression CNN. Since saliency maps methods have been developed for classification CNN mostly, we provide an interpretation for regression saliency maps, as well as an adaptation of a perturbation-based quantitative evaluation of explanation …