Difficulties in orientation in space (in terms of left and right)?
One main limitation of US is the difficulty in spatial orientation that largely is due to the different planes of US images if compared to the traditional orthogonal planes of MRI; moreover, US is not panoramic like MRI.
Under usual conditions, however, we have no difficulty in sensing the orientation of the head relative to the vertical, even with the eyes closed and in the presence of appreciable accelerations, provided the latter have short duration (as those of a car or train).
Diffusion magnetic resonance imaging tractography can provide nondestructive, 3D, brain-wide connectivity maps, but has historically been limited by low spatial resolution, low signal-to-noise ratio, and the difficulty in estimating multiple fiber orientations within a single image voxel.
So far, Yamauchi et al. (2011) showed only one example of quantitative examination due to the difficulty in deriving the magnetic field orientation.
The other subjects, favouring a proprioceptive body/floor angular coding, via the ankle, presented under microgravity no difficulty in maintaining horizontal forearm's orientation.
In this study, poor temporal orientation and difficulty in reading, both items of the MMSE, were explanatory variables of ADL dependence.
Instead, US planes are consequences of probe positioning and this leads to a consistent difficulty in figuring out the spatial orientation of B-mode images.
The difficulty in consistent AI measurement is precise orientation of the pelvis during radiographic imaging because different orientations of the pelvis will lead to different AI measurements [ 12].
Existing protein immobilization approaches, including noncovalent or covalent attachments to solid supports, have difficulties in controlling protein orientation, reducing nonspecific absorption and preventing protein denaturation.
