<p><strong>Abstract.</strong> New low-cost hyperspectral frame sensors have created a new perspective for remote sensing applications. In this work, we investigate some issues related to the geometric calibration of a hyperspectral frame camera based of FPI (Fabry-Pérot Interferometer), the Rikola camera. The approach proposed in paper is to study the changes in internal optical path caused by the FPI and by the splitting prism. The aim is to model the changes in the IOPs with an analytical function and also to estimate the misalignments between sensors. Several experiments were performed. The changes in position of a specific point were analasyzed to confirm that the bundle of rays is deviated. A self-calibrating bundle adjustment was performed and the Interior Orientation Parameters (IOP) of each band were estimated. The IOPs were analysed and it was concluded that a single set of symmetrical radial distortion parameters can be used for all band. Also, the estimated parameters for each image band were analysed as a function of the air gap of the FPI interferometer. It was noticed some correlation between the focal length and the air gap, and an air-gap dependent model was estimated. Thus, instead of considering an IOP set for each band or for each sensor, a single set of distortion parameters and another set of parameters that is “air-gap dependent”, was assessed. Another important issue was the determination of the misalignment angles between the two sensors, which can explain some differences in the recovered camera trajectory when performing the bundle adjustment.</p>

The sternalis muscle (SM), as known as rectus sterni, is an anomalous structure that lays at the anterior thoracic wall, which can be visualized as a unilateral or bilateral muscle. In this article, we report the existence of two SM's in a male fetus that aged 25 weeks. Despite the poor knowledge about proximal and distal attachments, vascularization and innervation of the SM, this structure can be the cause of different clinical implications. The presence of the SM can be wrongly interpreted by professionals as tumors at the anterior chest wall during mammographies and provoke electrical alterations at eletrocardiographies. The previous knowledge of the characteristics of the SM is crucial, as long as it allows professionals to correctly make the differential diagnosis between that muscle and benign or malign tumors at the anterior chest wall. In addition, since SM is known by surgeons, it can be used at breast reconstructive procedures.

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