Among various widely used thermal non-destructive testing methods, non-stationary thermal non-destructive testing modalities have proved to be an indispensable approach for the inspection and evaluation of various solid materials. These techniques facilitate the use of low peak power heat sources in a moderate time compared with the conventional widely used pulsed and sinusoidal modulated (lock-in) thermographic techniques. In this reported work, Barker non-stationary excitation followed by Hilbert transform-based matched filtering for the detection of subsurface features lying deep inside a glass fibrereinforced plastic test sample is incorporated. Results obtained from this pulse compression approach are less affected by random noise generated inside the test sample during experimentation as well as the variations of surface emissivity over the test sample. A comparison has been carried out among the amplitude, time delay and phase images obtained for the experimentally matched filter data.
Keros classification provides an objective assessment of anterior skull base anatomy and can therefore guide the surgeon on the superior extent of medial wall bone removal during orbital decompression. This may help improve the safety profile of the procedure.
This manuscript highlights a novel data processing approach for active infrared non-destructive testing and evaluation of carbon fibre reinforced polymers (CFRP). This is accomplished by performing spectral reshaping on a captured pre-processed linear frequency modulated thermal profile over the specimen. Results obtained from the Gaussian windowed frequency modulated thermal wave imaging (GWFMTWI) clearly shows better detection capabilities with improved test resolution and sensitivity. Further multi-transform techniques have been introduced both in time and frequency in order to test subsurface defect capabilities of the proposed approach.
We report the case of a 61-year-old male presenting with a giant nonfunctioning pituitary tumour extending into the third ventricle and thereby causing obstructive hydrocephalus. The main complaints consisted of disturbed vision and somnolence. The patient was initially treated by ventriculoperitoneal shunting, with immediate improvement of his mental status. Transcranial resection of the tumour was performed shortly thereafter, but only a limited part of the tumour could safely be removed. By immunohistochemistry the diagnosis of gonadotroph adenoma was made. After the operation, the patient's vision deteriorated temporarily. Because of the risk of further damage to the optic nerve, radiation therapy was postponed. Instead, treatment with the long-acting dopamine agonist cabergoline was instituted, which resulted in a gradual improvement of vision. Two years later a transsphenoidal operation was performed because of acute worsening of the visual fields due to central tumour necrosis with slight volume expansion. Vision improved considerably after surgery. Radiotherapy is scheduled in the near future. This case is an illustration of the complications of giant nonfunctioning pituitary adenomas. The therapeutical approach to obstructive hydrocephalus in these instances is reviewed.
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