After visual examination and artefact corrections, the average HR and the SD of the instantaneous beat-to-beat R R interval variability measured from Poincaré plots (LnSD1) were calculated using the last 3 min of the recording and was used as a measure of cardiac parasympathetic activity.
For inclusion subjects had to have had two MR examinations without artefacts, performed on the same MR system using the same imaging protocol.
To maximize this potential, the examination of the artefact under inspection must be as thorough and detailed as possible.
Detailed examination of prehistoric artefact assemblages has revealed at least two visual types of Lipari obsidian, one black and highly transparent, the other gray-banded, often with many spherulites present, suggesting that different obsidian outcrops might have different chemical fingerprints that would be useful for interpretation of prehistoric exploitation practices.
Advances in analytical technology have led to increasing interest in the scientific examination of precious artefacts and antiquities.
Fourthly, each observer determined the presence of artefacts per examination.
Unless there are other reasons (such as obvious learning effects, high false-positive errors, rim artefacts) examinations should not be removed from the analyses.
While Gosselin et al. suggest the practice of hyperventilating the patient prior to the examination to reduce the mixing artefact [5], Wittram and Yoo propose that this prescanning hyperventilation may be actually a potential cause [6] and could explain the different incidence of TIC between their study population and Gosselin's.
CT is superior in the routine work to MRI: wide spread use, easy performance, standard reproducibility, relatively low cost, short examination time, resulting less motion artefact, superior information of cortical bone and bone lamellas without marrow space.
In particular, movement artefact can render examinations non-diagnostic.
