PET methods are limited by high cost, limited availability of equipment and poor anatomic resolution.
However, in general, these methods are limited to detection of objects greater than 10 cm.
Potential flow methods are limited by its exclusion of viscous effect.
These methods are limited by the temporal resolution, as well as image quality.
Emerging 3D printing methods are limited to non-conforming rigid materials, with wide tolerance bands.
Current methods are limited in their capacity to search for complex patterns in geographic data sets.
Experimental methods are limited in terms of time, efficiency, cost and performance constraints.
The controlled studies of nonpharmacologic methods are limited in number and sometimes provide conflicting results.
Common optical methods are limited in bubble columns with a large void fraction.
However, most methods are limited by their accuracy, complexity of implementation, and scalability.
However, Markov chain-based methods, similar to the adiabatic methods, are limited to the cases where the Markov-matrix gaps cannot be too small to achieve convergence33.
