Discrete Fourier Transform Windowing Techniques for Cerebral Physiological Research in Neural Injury: A Practical Demonstration
To optimally assess oscillatory phenomena within physiological variables, spectral domain transforms are used. A discrete Fourier transform (DFT) is one of the most common methods used to attain this spectral change. In traumatic brain injury (TBI), a DFT is used to derive more complicated methods o...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Mary Ann Liebert
2023-06-01
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| Series: | Neurotrauma Reports |
| Subjects: | |
| Online Access: | https://www.liebertpub.com/doi/full/10.1089/NEUR.2022.0079 |
| _version_ | 1827374132916912128 |
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| author | Logan Froese Amanjyot Singh Sainbhi Alwyn Gomez Izzy Marquez Fiorella Amenta Carleen Batson Kevin Y. Stein Frederick A. Zeiler |
| author_facet | Logan Froese Amanjyot Singh Sainbhi Alwyn Gomez Izzy Marquez Fiorella Amenta Carleen Batson Kevin Y. Stein Frederick A. Zeiler |
| author_sort | Logan Froese |
| collection | DOAJ |
| description | To optimally assess oscillatory phenomena within physiological variables, spectral domain transforms are used. A discrete Fourier transform (DFT) is one of the most common methods used to attain this spectral change. In traumatic brain injury (TBI), a DFT is used to derive more complicated methods of physiological assessment, particularly that of cerebrovascular reactivity (CVR). However, a practical application of a DFT will introduce various errors that need to be considered. This study will evaluate the pulse amplitude DFT derivation of intracranial pressure (AMP) to highlight how slight differences in DFT methodologies can impact calculations. Utilizing a high-frequency prospectively maintained data set of TBI patients with recorded arterial and intracranial blood pressure, various cerebral physiological aspects of interest were assessed using the DFT windowing methods of rectangular, Hanning, and Chebyshev. These included AMP, CVR indices (including the pressure reactivity and pulse amplitude index), and the optimal cerebral perfusion pressure (with all methods of CVR). The results of the different DFT-derived windowing methods were compared using the Wilcoxon signed-ranked test and histogram plots between individual patients and over the whole 100-patient cohort. The results for this analysis demonstrate that, overall and for grand average values, there were limited differences between the different DFT windowing techniques. However, there were individual patient outliers to whom the different methods resulted in noticeably different overall values. From this information, for derived indices utilizing a DFT in the assessment of AMP, there are limited differences within the resulting calculations for larger aggregates of data. However, when the amplitude of spectrally resolved response is important and needs to be robust in smaller moments in time, it is recommended to use a window that has amplitude accuracy (such as Chebyshev or flat-top). |
| first_indexed | 2024-03-08T11:28:18Z |
| format | Article |
| id | doaj.art-bff8d9c1d72d4e629d2ebce81eabdfb6 |
| institution | Directory Open Access Journal |
| issn | 2689-288X |
| language | English |
| last_indexed | 2024-03-08T11:28:18Z |
| publishDate | 2023-06-01 |
| publisher | Mary Ann Liebert |
| record_format | Article |
| series | Neurotrauma Reports |
| spelling | doaj.art-bff8d9c1d72d4e629d2ebce81eabdfb62024-01-26T04:40:58ZengMary Ann LiebertNeurotrauma Reports2689-288X2023-06-014141041910.1089/NEUR.2022.0079Discrete Fourier Transform Windowing Techniques for Cerebral Physiological Research in Neural Injury: A Practical DemonstrationLogan FroeseAmanjyot Singh SainbhiAlwyn GomezIzzy MarquezFiorella AmentaCarleen BatsonKevin Y. SteinFrederick A. ZeilerTo optimally assess oscillatory phenomena within physiological variables, spectral domain transforms are used. A discrete Fourier transform (DFT) is one of the most common methods used to attain this spectral change. In traumatic brain injury (TBI), a DFT is used to derive more complicated methods of physiological assessment, particularly that of cerebrovascular reactivity (CVR). However, a practical application of a DFT will introduce various errors that need to be considered. This study will evaluate the pulse amplitude DFT derivation of intracranial pressure (AMP) to highlight how slight differences in DFT methodologies can impact calculations. Utilizing a high-frequency prospectively maintained data set of TBI patients with recorded arterial and intracranial blood pressure, various cerebral physiological aspects of interest were assessed using the DFT windowing methods of rectangular, Hanning, and Chebyshev. These included AMP, CVR indices (including the pressure reactivity and pulse amplitude index), and the optimal cerebral perfusion pressure (with all methods of CVR). The results of the different DFT-derived windowing methods were compared using the Wilcoxon signed-ranked test and histogram plots between individual patients and over the whole 100-patient cohort. The results for this analysis demonstrate that, overall and for grand average values, there were limited differences between the different DFT windowing techniques. However, there were individual patient outliers to whom the different methods resulted in noticeably different overall values. From this information, for derived indices utilizing a DFT in the assessment of AMP, there are limited differences within the resulting calculations for larger aggregates of data. However, when the amplitude of spectrally resolved response is important and needs to be robust in smaller moments in time, it is recommended to use a window that has amplitude accuracy (such as Chebyshev or flat-top).https://www.liebertpub.com/doi/full/10.1089/NEUR.2022.0079blood flowFourier transformmodels of injurypulse amplitudetraumatic brain injurywaveform |
| spellingShingle | Logan Froese Amanjyot Singh Sainbhi Alwyn Gomez Izzy Marquez Fiorella Amenta Carleen Batson Kevin Y. Stein Frederick A. Zeiler Discrete Fourier Transform Windowing Techniques for Cerebral Physiological Research in Neural Injury: A Practical Demonstration Neurotrauma Reports blood flow Fourier transform models of injury pulse amplitude traumatic brain injury waveform |
| title | Discrete Fourier Transform Windowing Techniques for Cerebral Physiological Research in Neural Injury: A Practical Demonstration |
| title_full | Discrete Fourier Transform Windowing Techniques for Cerebral Physiological Research in Neural Injury: A Practical Demonstration |
| title_fullStr | Discrete Fourier Transform Windowing Techniques for Cerebral Physiological Research in Neural Injury: A Practical Demonstration |
| title_full_unstemmed | Discrete Fourier Transform Windowing Techniques for Cerebral Physiological Research in Neural Injury: A Practical Demonstration |
| title_short | Discrete Fourier Transform Windowing Techniques for Cerebral Physiological Research in Neural Injury: A Practical Demonstration |
| title_sort | discrete fourier transform windowing techniques for cerebral physiological research in neural injury a practical demonstration |
| topic | blood flow Fourier transform models of injury pulse amplitude traumatic brain injury waveform |
| url | https://www.liebertpub.com/doi/full/10.1089/NEUR.2022.0079 |
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