Method Development RR Example - Revision history

MriFranz: /* Example Registered Report Abstract - Method Development */ new format

2025-07-04T15:15:40Z

Example Registered Report Abstract - Method Development: new format

← Older revision		Revision as of 17:15, 4 July 2025
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	== Introduction ==		== Introduction ==
			=== Background and motivation ===
	Accurate quantification of T1 relaxation times in brain tissue is crucial for detecting subtle pathological changes and for longitudinal assessment of disease progression. Current T1 mapping techniques suffer from various limitations including sensitivity to B1 inhomogeneities, long acquisition times, or limited precision in specific tissue types. We propose a novel approach (FastT1) that addresses these limitations by combining undersampled radial acquisitions with a tissue-specific signal model. This registered report outlines our validation plan to evaluate the accuracy, precision, and clinical utility of FastT1 compared to established methods.		Accurate quantification of T1 relaxation times in brain tissue is crucial for detecting subtle pathological changes and for longitudinal assessment of disease progression. Current T1 mapping techniques suffer from various limitations including sensitivity to B1 inhomogeneities, long acquisition times, or limited precision in specific tissue types. We propose a novel approach (FastT1) that addresses these limitations by combining undersampled radial acquisitions with a tissue-specific signal model. This registered report outlines our validation plan to evaluate the accuracy, precision, and clinical utility of FastT1 compared to established methods.

	== ~~Theory and methods~~ ==		=== Hypothesis ===
	FastT1 ~~uses a specific RF pulse scheme~~ in ~~a radial gradient echo~~ acquisition to ~~sensitize the readout to multiple T1 values~~.		We hypothesize that FastT1 will provide T1 measurements with (1) equivalent or superior accuracy (< 3% deviation from reference standards) compared to the current gold standard (inversion recovery spin echo), (2) improved precision (< 5% coefficient of variation) in white matter structures, and (3) reduced acquisition time (< 3 minutes for whole-brain coverage), while maintaining robustness to B1 inhomogeneities (< 2% error for B1 variations of ±20%).

	== ~~Hypothesis~~ ==		== Methodology ==
	~~We hypothesize that~~ FastT1 ~~will provide~~ T1 ~~measurements~~ with ~~(1) equivalent or superior accuracy (< 3% deviation~~ from ~~reference standards) compared~~ to ~~the current gold standard (inversion recovery spin echo), (2) improved precision (< 5% coefficient of variation) in white matter structures~~, and (3~~) reduced acquisition time (< 3 minutes for whole-brain coverage)~~, ~~while maintaining robustness to B1 inhomogeneities (< 2% error for B1 variations~~ of ~~±20%)~~.		FastT1 uses a specific RF pulse scheme in a radial gradient echo acquisition to sensitize the readout to multiple T1 values. This was tested on a clinical whole-body 3T scanner on n=8 phantoms with T1 values ranging from 300 to 2000ms, and on n=3 healthy volunteers, with an axial scan of the brain.

	== ~~Preliminary Data~~ ==		== Current status and preliminary results ==
	Initial phantom experiments ~~(n=8 T1 values ranging from 300-2000ms)~~ demonstrate a strong correlation between our method and reference standards (r=0.98, p<0.001) with mean difference of 2.1% across the T1 range. ~~Preliminary in~~ vivo testing in healthy volunteers ~~(n=5) shows~~ consistent ~~T1 measurements across repeated scans~~ (~~coefficient of variation: 3.8% in~~ white matter, ~~4.2% in gray~~ matter~~) and minimal sensitivity to simulated B1 variations (1.8% change in T1 with ±15% B1 variation~~). Whole-brain coverage was achieved in 2:47 minutes.		Initial phantom experiments demonstrate a strong correlation between our method and reference standards (r=0.98, p<0.001) with mean difference of 2.1% across the T1 range. In vivo testing in healthy volunteers showed T1 values in a range consistent with the literature (white matter: 911±15ms, grey matter: 1450±101ms). Whole-brain coverage was achieved in 2:47 minutes.

	== ~~Study protocol~~ ==		== Plan and Outlook ==

	=== Study ~~Design~~ ===		=== Study Protocol ===
	We will conduct a two-part validation study: (1) comprehensive phantom validation and (2) in vivo validation in healthy volunteers (n=20) and patients with multiple sclerosis (n=15).		We will conduct a two-part validation study: (1) comprehensive phantom validation and (2) in vivo validation in healthy volunteers (n=20) and patients with multiple sclerosis (n=15).

	~~=== MR Acquisition ===~~
	All scans will be performed on a 3T MRI system (Manufacturer, Model) with a 32-channel head coil. The protocol will include:		All scans will be performed on a 3T MRI system (Manufacturer, Model) with a 32-channel head coil. The protocol will include:
	* FastT1 acquisition (prototype sequence)		* FastT1 acquisition (prototype sequence)
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	Each subject will be scanned twice within a 7-day interval to assess reproducibility.		Each subject will be scanned twice within a 7-day interval to assess reproducibility.

	~~=== Analysis Approach ===~~
	T1 maps will be generated using method-specific reconstruction algorithms. ROI analysis will be performed in standardized brain regions (frontal WM, occipital WM, thalamus, putamen, cortical GM). For MS patients, additional ROI analysis will include lesions and normal-appearing white matter. Bland-Altman analysis will assess agreement between methods.		T1 maps will be generated using method-specific reconstruction algorithms. ROI analysis will be performed in standardized brain regions (frontal WM, occipital WM, thalamus, putamen, cortical GM). For MS patients, additional ROI analysis will include lesions and normal-appearing white matter. Bland-Altman analysis will assess agreement between methods.

	== Statistical Analysis Plan ==		=== Statistical Analysis Plan ===

	=== Primary Outcomes ===		==== Primary Outcomes ====
	# Accuracy: Mean percentage difference between FastT1 and IRSE measurements		# Accuracy: Mean percentage difference between FastT1 and IRSE measurements
	# Precision: Coefficient of variation between repeated measurements		# Precision: Coefficient of variation between repeated measurements
	# B1 sensitivity: Percentage change in T1 with simulated B1 variations		# B1 sensitivity: Percentage change in T1 with simulated B1 variations

	=== Sample Size Justification ===		==== Sample Size Justification ====
	Based on our preliminary data (mean difference of 2.1%, SD=1.2%), a sample of 20 healthy volunteers will provide 95% power to detect a 3% difference from the reference standard (α=0.05). For MS patients, 15 subjects will allow detection of a 5% difference in T1 values between normal-appearing white matter and lesions (α=0.05, power=90%).		Based on our preliminary data (mean difference of 2.1%, SD=1.2%), a sample of 20 healthy volunteers will provide 95% power to detect a 3% difference from the reference standard (α=0.05). For MS patients, 15 subjects will allow detection of a 5% difference in T1 values between normal-appearing white matter and lesions (α=0.05, power=90%).

	=== Statistical Tests ===		==== Statistical Tests ====
	* Paired t-tests for method comparisons		* Paired t-tests for method comparisons
	* Intraclass correlation coefficients for reproducibility		* Intraclass correlation coefficients for reproducibility
	* ANOVA for effects of B1 variation on T1 measurements		* ANOVA for effects of B1 variation on T1 measurements
	* Linear regression to assess agreement with reference standards		* Linear regression to assess agreement with reference standards

MriFranz: /* Example Registered Report Abstract - Method Development */ fix

2025-05-27T13:16:46Z

Example Registered Report Abstract - Method Development: fix

← Older revision		Revision as of 15:16, 27 May 2025
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	=== MR Acquisition ===		=== MR Acquisition ===
	All scans will be performed on a 3T MRI system (Manufacturer, Model) with a 32-channel head coil. The protocol will include:		All scans will be performed on a 3T MRI system (Manufacturer, Model) with a 32-channel head coil. The protocol will include:

	* FastT1 acquisition (prototype sequence)		* FastT1 acquisition (prototype sequence)
	* Inversion recovery spin echo (IRSE) as reference standard		* Inversion recovery spin echo (IRSE) as reference standard
	* Variable flip angle (VFA) method		* Variable flip angle (VFA) method
	* MP2RAGE sequence		* MP2RAGE sequence

	Each subject will be scanned twice within a 7-day interval to assess reproducibility.		Each subject will be scanned twice within a 7-day interval to assess reproducibility.

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	=== Primary Outcomes ===		=== Primary Outcomes ===

	# Accuracy: Mean percentage difference between FastT1 and IRSE measurements		# Accuracy: Mean percentage difference between FastT1 and IRSE measurements
	# Precision: Coefficient of variation between repeated measurements		# Precision: Coefficient of variation between repeated measurements
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	=== Statistical Tests ===		=== Statistical Tests ===

	* Paired t-tests for method comparisons		* Paired t-tests for method comparisons
	* Intraclass correlation coefficients for reproducibility		* Intraclass correlation coefficients for reproducibility
	* ANOVA for effects of B1 variation on T1 measurements		* ANOVA for effects of B1 variation on T1 measurements
	* Linear regression to assess agreement with reference standards		* Linear regression to assess agreement with reference standards

MriFranz: /* Title */

2025-05-27T12:29:12Z

Title

← Older revision		Revision as of 14:29, 27 May 2025
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	== Title ==		== Title ==
	Fast B1-Insensitive Mapping of T1 Relaxation Times in the Brain: A Registered Report		'''Fast B1-Insensitive Mapping of T1 Relaxation Times in the Brain: A Registered Report'''

	== Introduction ==		== Introduction ==

MriFranz: /* Title: Fast B1-Insensitive Mapping of T1 Relaxation Times in the Brain: A Registered Report */ fix

2025-05-27T12:29:01Z

Title: Fast B1-Insensitive Mapping of T1 Relaxation Times in the Brain: A Registered Report: fix

← Older revision		Revision as of 14:29, 27 May 2025
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	= Example Registered Report Abstract - Method Development =		= Example Registered Report Abstract - Method Development =

	== Title: Fast B1-Insensitive Mapping of T1 Relaxation Times in the Brain: A Registered Report ==		== Title ==
			Fast B1-Insensitive Mapping of T1 Relaxation Times in the Brain: A Registered Report

	== Introduction ==		== Introduction ==

MriFranz: Text

2025-05-27T08:49:43Z

Text

← Older revision		Revision as of 10:49, 27 May 2025
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	= Example Registered Report Abstract - Method Development =		= Example Registered Report Abstract - Method Development =

			== Title: Fast B1-Insensitive Mapping of T1 Relaxation Times in the Brain: A Registered Report ==

			== Introduction ==
			Accurate quantification of T1 relaxation times in brain tissue is crucial for detecting subtle pathological changes and for longitudinal assessment of disease progression. Current T1 mapping techniques suffer from various limitations including sensitivity to B1 inhomogeneities, long acquisition times, or limited precision in specific tissue types. We propose a novel approach (FastT1) that addresses these limitations by combining undersampled radial acquisitions with a tissue-specific signal model. This registered report outlines our validation plan to evaluate the accuracy, precision, and clinical utility of FastT1 compared to established methods.

			== Theory and methods ==
			FastT1 uses a specific RF pulse scheme in a radial gradient echo acquisition to sensitize the readout to multiple T1 values.

			== Hypothesis ==
			We hypothesize that FastT1 will provide T1 measurements with (1) equivalent or superior accuracy (< 3% deviation from reference standards) compared to the current gold standard (inversion recovery spin echo), (2) improved precision (< 5% coefficient of variation) in white matter structures, and (3) reduced acquisition time (< 3 minutes for whole-brain coverage), while maintaining robustness to B1 inhomogeneities (< 2% error for B1 variations of ±20%).

			== Preliminary Data ==
			Initial phantom experiments (n=8 T1 values ranging from 300-2000ms) demonstrate a strong correlation between our method and reference standards (r=0.98, p<0.001) with mean difference of 2.1% across the T1 range. Preliminary in vivo testing in healthy volunteers (n=5) shows consistent T1 measurements across repeated scans (coefficient of variation: 3.8% in white matter, 4.2% in gray matter) and minimal sensitivity to simulated B1 variations (1.8% change in T1 with ±15% B1 variation). Whole-brain coverage was achieved in 2:47 minutes.

			== Study protocol ==

			=== Study Design ===
			We will conduct a two-part validation study: (1) comprehensive phantom validation and (2) in vivo validation in healthy volunteers (n=20) and patients with multiple sclerosis (n=15).

			=== MR Acquisition ===
			All scans will be performed on a 3T MRI system (Manufacturer, Model) with a 32-channel head coil. The protocol will include:

			* FastT1 acquisition (prototype sequence)
			* Inversion recovery spin echo (IRSE) as reference standard
			* Variable flip angle (VFA) method
			* MP2RAGE sequence

			Each subject will be scanned twice within a 7-day interval to assess reproducibility.

			=== Analysis Approach ===
			T1 maps will be generated using method-specific reconstruction algorithms. ROI analysis will be performed in standardized brain regions (frontal WM, occipital WM, thalamus, putamen, cortical GM). For MS patients, additional ROI analysis will include lesions and normal-appearing white matter. Bland-Altman analysis will assess agreement between methods.

			== Statistical Analysis Plan ==

			=== Primary Outcomes ===

			# Accuracy: Mean percentage difference between FastT1 and IRSE measurements
			# Precision: Coefficient of variation between repeated measurements
			# B1 sensitivity: Percentage change in T1 with simulated B1 variations

			=== Sample Size Justification ===
			Based on our preliminary data (mean difference of 2.1%, SD=1.2%), a sample of 20 healthy volunteers will provide 95% power to detect a 3% difference from the reference standard (α=0.05). For MS patients, 15 subjects will allow detection of a 5% difference in T1 values between normal-appearing white matter and lesions (α=0.05, power=90%).

			=== Statistical Tests ===

			* Paired t-tests for method comparisons
			* Intraclass correlation coefficients for reproducibility
			* ANOVA for effects of B1 variation on T1 measurements
			* Linear regression to assess agreement with reference standards

MriFranz: Example

2025-05-27T08:48:41Z

Example

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= Example Registered Report Abstract - Method Development =