Comparison of Eye Lens Dose on Neuroimaging Protocols between 16- and 64-Section Multidetector CT: Achieving the Lowest Possible Dose

Tan, Judy S. P.; Tan, K.-L.; Lee, J.C.L.; Wan, C.-M.; Leong, Jamie; Chan, Ling‐Ling

doi:10.3174/ajnr.a1327

Cited by 33 publications

(19 citation statements)

References 16 publications

(16 reference statements)

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“…These results are already comparable to average eye lens dose achieved in non-helical CT scans performed in tilted axial mode: 18.1 ± 7.6 mGy with automatic tube current modulation switched off and 15.6 ± 4.2 mGy with automatic tube current modulation switched on 12 . This is also the first study on patients in routine clinical settings, based on eye lens dose calculations in head MDCT protocols utilizing IR algorithms.…”

supporting

confidence: 73%

“…The achieved effective and organ doses in our study population are at the very low end of published ranges 1,[11][12][25][26][27][28] . Albeit undoubtedly beneficial from the radiation safety point of view, the study might have limitations, namely decreased image quality and the inferior diagnostic performance of such scans.…”

mentioning

confidence: 71%

“…Thus, the need for standardization, optimization, and stringent adherence to ALARA ("as low as reasonably achievable") principles is of utmost importance. Nonetheless, even recent publications indicate that there is substantial variance of doses applied for the same types of CT procedures on different scanners and at different institutions as well as significant potential for reducing radiation dose in routine CT examinations 11,12 . A multicentric study from California showed a great deal of variance with a 20-fold difference across effective doses applied at routine head MDCT scans among four institutions: median of 2 mSv with absolute range of 0.3 -6 mSv (ref.…”

Section: Discussionmentioning

confidence: 99%

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Reduction of effective dose and organ dose to the eye lens in head MDCT using iterative image reconstruction and automatic tube current modulation

Ryška¹,

Kvasnička²,

Jandura³

et al. 2014

BIOMED PAP

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Aims.To compare the effective and eye lens radiation dose in helical MDCT brain examinations using automatic tube current modulation in conjunction with either standard filtered back projection (FBP) technique or iterative reconstruction in image space (IRIS). Methods. Of 400 adult brain MDCT examinations, 200 were performed using FBP and 200 using IRIS with the following parameters: tube voltage 120 kV, rotation period 1 second, pitch factor 0.55, automatic tube current modulation in both transverse and longitudinal planes with reference mAs 300 (FBP) and 200 (IRIS). Doses were calculated from CT dose index and dose length product values utilising ImPACT software; the organ dose to the lens was derived from the actual tube current-time product value applied to the lens. Image quality was assessed by two independent readers blinded to the type of image reconstruction technique. Results. The average effective scan dose was 1.47±0.26 mSv (FBP) and 0.98±0.15 mSv (IRIS), respectively (33.3% decrease). The average organ dose to the eye lens decreased from 40.0±3.3 mGy (FBP) to 26.6±2.0 mGy (IRIS, 33.5% decrease). No significant change in diagnostic image quality was noted between IRIS and FBP scans (P=0.17). Conclusion. Iterative reconstruction of cerebral MDCT examinations enables reduction of both effective and organ eye lens dose by one third without signficant loss of image quality.

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supporting

confidence: 73%

mentioning

confidence: 71%

Section: Discussionmentioning

confidence: 99%

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Reduction of effective dose and organ dose to the eye lens in head MDCT using iterative image reconstruction and automatic tube current modulation

Ryška¹,

Kvasnička²,

Jandura³

et al. 2014

BIOMED PAP

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“…However, the increase of CT testing is suspected to be a cause of the rising rate of carcinogenesis. It is already known that even low dose scans can occasionally cause leukemia, breast cancer, thyroid cancer, lung cancer, and other cancers [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…At this time, the radiation dose loaded upon the head of patients is reported to be about 50 mGy of which about 1.5% * 2% directly affects the eyes [6,11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of radiation exposure upon visual organs during a head CT scan

Kim

Lim

Chung

2012

Journal of Nuclear Science and Technology

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In order to analyze and compare the absorbed radiation dose and dose rate of visual organs (eyes, corneas, and lenses) of the head with the surrounding areas of the head during CT scans, a mathematical head phantom was created. In addition, the amount of radiation exposure reduced when using an eye shield was also analyzed. According to the results, it was found that the absorbed dose was highest when using 120 kV (as compared to 80 kV and 100 kV) and the absorbed dose rate of the visual organs compared to the head was about 1.35% for the eyes, 0.9% for the corneas, and 0.095% for the lenses. Finally, it was shown that the dose reduction rate of each organ when using an eye shield was about 24% for the eyes, about 22% for the corneas, and more than 40% for the lenses.

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