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- Risberg, Jarl, et al.
(författare)
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A new tomographic technique for absolute measurements of white and gray matter blood flow
- 2004
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Ingår i: Proceedings of the 8th Nordic Meeting in Neuropsychology, Turku, Finland, August 26–29, 2004, 85.
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Konferensbidrag (refereegranskat)abstract
- Objective. Most methods for measurements of the regional cerebral blood flow are unable to provide absolute blood flow values. Until now interest has been focused on measurement of the gray matter blood flow, while the white matter blood flow has been rather neglected. The aim of the present project was to develop and evaluate an improved method for reliable tomographic measurements of absolute white and gray matter blood flow Method. The new tomographic method (modified Xe-SPECT) is based on an extension of the period of 133Xe inhalation from one to eight minutes followed by 22 instead of four minutes of breathing of ambient air. This gives a markedly enhanced signal from the white matter and better basis for correct quantification of the blood flow. The arrival and clearance of the tracer are recorded by a three head gamma camera system that provides flow maps with a spatial resolution of about one cm. Results The new method has been evaluated in 33 healthy younger and older (around 70 years) subjects as well as in a group of elderly patients with organic dementia. Our preliminary findings indicate that new and clinically valuable information is obtained by the improved Xe-SPECT method.
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| 3. |
- Risberg, Jarl, et al.
(författare)
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A new tomographic technique for absolute measurements of white and gray matter blood flow
- 2003
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Ingår i: Journal of the International Neuropsychological Society. - 1355-6177. ; 9, s. 323-323
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Konferensbidrag (refereegranskat)abstract
- The integrity of the white matter is as important as that of the gray matter and white matter pathology has commonly been reported in elderly subjects and in patients with organic dementia. The aim of the present study is to develop and evaluate an improved method for reliable tomographic measurements of absolute white and gray matter blood flow. The new tomographic method (modified Xe-SPECT) is based on an extension of the period of 133Xe inhalation from one to eight minutes followed by 22 instead of four minutes of breathing of ambient air. This gives a markedly enhanced signal from the white matter and better basis for correct quantification pf the blood flow. The arrival and clearance of the tracer are recorded by a three head gamma camera system that provides flow maps with a spatial resolution of about one cm. The new method has been evaluated in healthy younger and older (around 70 years) subjects as well as in a group of elderly patients with organic dementia. Our preliminary findings indicate that new and clinically valuable information is obtained by the improved Xe-SPECT method
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| 5. |
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| 6. |
- Risberg, Jarl, et al.
(författare)
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99mTC-HMPAO-SPECT related to clinical findings in patients with subjective experience of memory deficit
- 2004
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Ingår i: Proceedings of the 8th Nordic Meeting in Neuropsychology.
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Konferensbidrag (refereegranskat)abstract
- Objective. The aim was to evaluate cognitive impairments, psychiatric symptoms and cerebral blood flow (CBF) patterns in middle-aged and younger old patients with subjective experience of memory deficits. Methods. The CBF was measured by 99m-Tc-HMPAO-SPECT. The study group was heterogeneous with patients fulfilling criteria for dementia (n=13) and patients with mild cognitive impairment (MCI; n= 24) as well as with not verified cognitive impairment (Non-MCI; n=17). The MCI patients were subdivided into two groups. The MCI type 1 group (n=14) had isolated memory impairments while the MCI type 2 group (n=10) had memory impairments together with slight verbal and/or visuospatial disturbances. Results. The MCI type 1 group showed lower blood flow in the left middle/inferior gyrus and in parts of the left inferior parietal lobe compared to the Non-MCI group. The MCI type 2 group showed reductions in the left anterior medial temporal lobe as well as in parts of the posterior cingulate gyrus. The Non-MCI patients reported high incidence (70%) of long-lasting psychosocial stress. Conclusions. The combination of clinical and CBF data provides diagnostically meaningful information about regional brain dysfunction in patients with memory deficits.
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| 8. |
- Vestberg, Susanna, et al.
(författare)
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Early signs of incipient dementia?
- 2001
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Ingår i: International Psychogeriatrics. - 1741-203X. ; 13:Suppl. 2, s. 215-215
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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