An organ and effective dose study of XVI and OBI cone‐beam CT systems

Hyer, Daniel E.; Serago, Christopher F.; Kim, Siyong; Li, Jonathan G.; Hintenlang, David E.

doi:10.1120/jacmp.v11i2.3183

Cited by 64 publications

(59 citation statements)

References 24 publications

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“…Several studies reported on the effective doses from kilovoltage CBCT [6,31,33,34,39,43,90]. In all these cases, the absorbed dose was measured in an anthropomorphic phantom and converted to effective dose using the tissue weighting factors obtained from International Commission on Radiological Protection (ICRP) reports 60 and 103 [91,92].…”

Section: Estimation Of Effective Dose From Cbct Imagingmentioning

confidence: 99%

Imaging dose from cone beam computed tomography in radiation therapy

2015

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Imaging dose in radiation therapy has traditionally been ignored due to its low magnitude and frequency in comparison to therapeutic dose used to treat patients. The advent of modern, volumetric, imaging modalities, often as an integral part of linear accelerators, has facilitated the implementation of image-guided radiation therapy (IGRT), which is often accomplished by daily imaging of patients. Daily imaging results in additional dose delivered to patient that warrants new attention be given to imaging dose. This review summarizes the imaging dose delivered to patients as the result of cone beam computed tomography (CBCT) imaging performed in radiation therapy using current methods and equipment. This review also summarizes methods to calculate the imaging dose, including the use of Monte Carlo (MC) and treatment planning systems (TPS). Peripheral dose from CBCT imaging, dose reduction methods, the use of effective dose in describing imaging dose, and the measurement of CT dose index (CTDI) in CBCT systems are also reviewed.

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Section: Estimation Of Effective Dose From Cbct Imagingmentioning

confidence: 99%

Imaging dose from cone beam computed tomography in radiation therapy

2015

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“…This was measured by Hyer et al . using a fiber-optic coupled dosimetric system (Hyer et al , 2010). The scan parameters were as follows: 125 kV, 800 ms, 13 mA and 655 projections.…”

Section: Discussionmentioning

confidence: 99%

“…Hyer et al . (Hyer et al , 2010) estimated effective dose to the pelvis, but did not study the dose dependence on projection angle. Furthermore, their field size was that of a conventional pelvic CBCT scan, i.e.…”

Section: Introductionmentioning

confidence: 99%

Estimation of effective imaging dose for kilovoltage intratreatment monitoring of the prostate position during cancer radiotherapy

Booth

Poulsen

et al. 2013

Phys. Med. Biol.

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Kilovoltage Intratreatment Monitoring (KIM) is a novel real-time localization modality where the tumor position is continuously measured during Intensity Modulated Radiation Therapy (IMRT) or Intensity Modulated Arc Therapy (IMAT) by a kilovoltage (kV) x-ray imager. Adding kV imaging during therapy adds radiation dose. The additional effective dose is quantified for prostate radiotherapy and compared to dose from other localization modalities. The software PCXMC 2.0 was used to calculate the effective dose delivered to a phantom as a function of imager angle and field size for a Varian On-Board Imager. The average angular effective dose was calculated for a field size of 6 cm × 6 cm. The average angular effective dose was used in calculations for different treatment scenarios. Treatment scenarios considered were treatment type and fractionation. For all treatment scenarios, (i.e. conventionally fractionated and SBRT; IMRT and IMAT), the total KIM dose at 1 Hz ranged from 2–10 mSv. This imaging dose is less than the Navotek radioactive implant dose (64 mSv) and a standard SBRT CBCT pretreatment scan dose (22 mSv) over an entire treatment regime. KIM delivers an acceptably low effective dose for daily use as a real-time image-guidance method for prostate radiotherapy.

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“…Daily online imaging has the best potential to correct for target position variation through the course of treatment. However, a concomitant pelvic dose of 3.7-4.3 mSv per CBCT exposure 14 should be taken into consideration when daily imaging is used. Further research is required to determine the optimal schedule for CBCT verification.…”

Section: Discussionmentioning

confidence: 99%

Image-guided radiotherapy for prostate cancer in the United Kingdom: a national survey

Ariyaratne¹,

Chesham²,

Alonzi³

2017

The British Journal of Radiology

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Objective: To survey the technology and practice of image-guided radiotherapy (IGRT) for prostate cancer in the UK. Methods: A pre-tested semi-structured online questionnaire was sent to National Health Service (NHS) and private radiotherapy providers in the UK between March and April 2014. The survey was carried out on the Opinio© online platform. Results: There was a high survey response rate of 83%. There is widespread use of intensity-modulated radiotherapy and advanced verification imaging modalities. Cone-beam CT (CBCT) is the main verification imaging modality in radical prostate radiotherapy, used in 66% of UK centres. Fiducial markers in combination with imaging were used in 30% of centres. Over half the centres used a daily imaging schedule, with a Day 1-3 frequency followed by weekly frequency used less commonly. 26% of centres used daily CBCT. Conclusion: There is widespread use of volumetric verification imaging with CBCT for prostate radiotherapy in the UK. There is no consensus on the optimal verification imaging schedule. Advances in knowledge: This survey provides an insight into contemporary UK practice of IGRT for prostate cancer, both in the NHS and private sector. It demonstrates the widespread use of CBCT imaging and highlights the need for further research to optimize the practice.

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An organ and effective dose study of XVI and OBI cone‐beam CT systems

Cited by 64 publications

References 24 publications

Imaging dose from cone beam computed tomography in radiation therapy

Imaging dose from cone beam computed tomography in radiation therapy

Estimation of effective imaging dose for kilovoltage intratreatment monitoring of the prostate position during cancer radiotherapy

Image-guided radiotherapy for prostate cancer in the United Kingdom: a national survey

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