Ocular Volumetry Using Fast High-Resolution MRI during Visual Fixation

Tanitame, Keizo; Sone, Takashi; Miyoshi, Takashi; Tanitame, Nobuko; Otani, Keiko; Akiyama, Yuji; Takasu, Miyuki; Date, Shuji; Kiuchi, Yoshiaki; Awai, Kazuo

doi:10.3174/ajnr.a3305

Cited by 5 publications

(2 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Within the human ophthalmology literature VOL is used extensively, including assessment of retinal and choroidal detachments, intraocular tumour evaluation and follow‐up, 3,21 evaluation of glaucomatous changes in the visual pathway 22 and detection of congenital abnormalities 23 . MRI is becoming increasingly available within the veterinary profession, and eyes are frequently included as part of a cranial study.…”

Section: Discussionmentioning

confidence: 99%

Magnetic resonance imaging of the normal canine eye using a T1‐weighted volumetric acquisition

Manchip¹,

Sansom

Donaldson³

et al. 2021

Veterinary Record

View full text Add to dashboard Cite

Purpose: MRI is becoming increasingly available within the veterinary profession, and eyes are frequently included as part of a cranial study. The advantages of volumetric imaging are numerous, when compared to traditional two-dimensional imaging, and could be utilised within the veterinary setting. This report describing the normal MRI appearance of the canine eye, aimed to establish a standard reference range on a T1w volumetric acquisition. Method: This study retrospectively assessed 62 eyes from 31 dogs that had undergone MRI at the Small Animal Hospital, Langford Vets, University of Bristol between 2016 and 2018 using a standardised MRI protocol. Dogs were excluded if they had presented with any reported ocular or orbital abnormalities. Measurements were performed from the 3D T1w volumetric sequence by a single observer using a previously published technique. Results: Mean axial globe length was 2.13 cm and equatorial width 2.16 cm. Mean anteroposterior depth of the anterior chamber was 0.40 cm and 0.97 cm for the vitreous chamber. The mean anteroposterior and equatorial distance of the lens was 0.75 cm and 1.15 cm, respectively. Mean optic nerve width was 0.15 cm, and the mean width of the entire optic nerve sheath was 0.43 cm. Statistically significant relationships were noted between age and axial globe length and both lens dimensions. Highly significant relationships were noted between all variables, except lens dimensions and body weight Conclusion: This study provides reference values to assist in the interpretation of ocular structures during MRI on a T1w volumetric acquisition canine, eyes, MRI, ocular, volumetric

show abstract

Section: Discussionmentioning

confidence: 99%

Magnetic resonance imaging of the normal canine eye using a T1‐weighted volumetric acquisition

Manchip¹,

Sansom

Donaldson³

et al. 2021

Veterinary Record

View full text Add to dashboard Cite

show abstract

“…Recently, with the development of high-field magnetic resonance imaging (MRI) systems and newer designs of radiofrequency coils, the acquisition of volumetric ocular MRI data that have a high intrinsic resolution in all three-dimensions became feasible. [ 11 – 13 ]…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis with volume rendering of pathological myopic eyes by high-resolution three-dimensional magnetic resonance imaging

Zhou

Chen

et al. 2020

Medicine

View full text Add to dashboard Cite

Discovering a relationship between axial length and vitreous volume would be helpful since the axial length is easier to measure than magnetic resonance imaging (MRI) parameters. This study aimed to analyze the topography of human eyes with pathological myopia through volume rendering images by high-resolution 3D-MRI and to establish a model to estimate the vitreous volume. This was a retrospective, non-randomized, controlled study of patients evaluated at Tongren Hospital from July 7, 2007 to December 12, 2018. The controls were emmetropic volunteers. All participants underwent ophthalmic examinations. Axial length was measured with an IOL Master. High-resolution 3D MRI and volume rendering was utilized for all the eyes. Logistic regression was used to establish a model to predict the vitreous volume. A total of 280 emmetropic eyes and 290 eyes with pathological myopia were included. Males represented 60.7% and 65.5% of the individuals. The mean axial lengths of those two groups were 23.1 ± 0.8 mm (95%CI: 22.7–23.4 mm) and 28.3 ± 2.2 mm (95%CI: 27.5–29.2 mm), respectively ( P < .001). The regression model in the pathological myopic group for calculating the vitreous volume according to the axial length was: Vitreous volume = 546.27 × axial length − 6977.12. The regression model in the emmetropic group for calculating the vitreous volume according to the axial length was: Vitreous volume = 458.35 × axial length − 6331.14 ( R 2 = 0.360, P = .001). Elongation of the axial length is involved in eyeball enlargement in pathological myopic eyes. Measurement of the axial length could be recommended for the estimation of the vitreous volume during vitrectomy if vitreous cavity filling is needed.

show abstract

Normative Measurements of Orbital Walls and Contents

Macey

Small

Ginat

2020

Manual of Normative Measurements in Head and Neck Imaging

View full text Add to dashboard Cite

Ocular Volumetry Using Fast High-Resolution MRI during Visual Fixation

Abstract: BACKGROUND AND PURPOSE: Volumetry may be useful for evaluating treatment response and prognosis of intraocular lesions. Phantom, volunteer, and patient studies were performed to determine whether ocular MR volumetry is reproducible.

Cited by 5 publications

References 26 publications

Magnetic resonance imaging of the normal canine eye using a T1‐weighted volumetric acquisition

Magnetic resonance imaging of the normal canine eye using a T1‐weighted volumetric acquisition

Quantitative analysis with volume rendering of pathological myopic eyes by high-resolution three-dimensional magnetic resonance imaging

Normative Measurements of Orbital Walls and Contents

Contact Info

Product

Resources

About