# Global description

## Evaluation

The above menu provides details on the different evaluation metrics used during the challenge. Specifically, the quality of the reconstructed image will be assessed through four different metrics: resolution, contrast, speckle quality and geometric distorsion. These metrics will be measured from :

• synthetic images generated from the well-known ultrasound simulator Field II;
• real acquisitions using a Verasonics system equipped with a linear array probe (128 elements, 0.30 mm pitch, 5.208 MHz central frequency, 20.832 MHz sampling frequency)

RANKING ON FOUR CATEGORIES

Four different categories are proposed for the competition:

1) challenge on the reconstruction of the best ultrasound image quality using only 1 plane wave;

2) challenge on the reconstruction of the best ultrasound image quality using 11 steered plane waves;

3) challenge on the reconstruction of the best ultrasound image quality using all the 75 steered plane waves;

4) challenge on the reconstruction of the best ultrasound image quality using the lowest number of steered plane waves;

For each of the categories, the participants are free to choose the set of angles they want in order to optimize their reconstruction strategy.

For the last category, the number of steered plane waves (NB) used for the reconstruction is open but has to be the same for all the phantoms. The challenger has to optimize the ratio between the image quality and the number of steered plane waves used since the final score will be normalized as:

$$\text{final score} = \frac{\sum_{\text{all metrics}} (points)}{1 + \frac{NB}{5} }$$

The participants are free to choose in which categories they want to compete. Participants can compete in one or several categories without any restriction.

At the end of the challenge (one week before the start of the IEEE IUS conference), in each category, the participant with the highest number of points attributed from the different evaluation metrics will be designated as the winner in the corresponding category. Thanks to the support of our sponsor Verasonics, each winner will receive a prize to be determined in the upcoming weeks.