X-ray dose reduction by adaptive source equalization and electronic region-of-interest control

Burion, Steve; Sandman, A.; Bechtel, Kate L.; Solomon, Edward G.; Funk, Tobias

doi:10.1117/12.877250

Cited by 6 publications

(5 citation statements)

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“…Recently, there has been a lot interest within the CT imaging community concerning fluence field modulation (Kolditz et al 2010, Heuscher & Noo 2011, Heuscher & Noo 2012, Bartolac et al 2010, Bartolac et al 2011, Bartolac & Jaffray 2012, Chen et al 2011, Stiller et al 2012, Sperl et al 2010, Burion et al 2011, Hsieh & Pelc 2013 a , Hsieh & Pelc 2013 b ). The ability to modulate the incident x-ray fluence in CT imaging has been proposed to implement volume of interest imaging (VOI) (Bartolac et al 2010, Bartolac et al 2011, Bartolac & Jaffray 2012, Kolditz et al 2010, Heuscher & Noo 2011, Heuscher & Noo 2012, Chen et al 2011), improve standard CT imaging (Stiller et al 2012, Sperl et al 2010, Burion et al 2011, Hsieh & Pelc 2013 a , Hsieh & Pelc 2013 b ), and may be a necessary technology if photon counting CT is to overcome detector saturation and charge trapping problems (McCollough et al 2012, Shikhaliev 2009).…”

Section: Introduction: a Short History Of Ffm In Ct Imagingmentioning

confidence: 99%

“…The ability to modulate the incident x-ray fluence in CT imaging has been proposed to implement volume of interest imaging (VOI) (Bartolac et al 2010, Bartolac et al 2011, Bartolac & Jaffray 2012, Kolditz et al 2010, Heuscher & Noo 2011, Heuscher & Noo 2012, Chen et al 2011), improve standard CT imaging (Stiller et al 2012, Sperl et al 2010, Burion et al 2011, Hsieh & Pelc 2013 a , Hsieh & Pelc 2013 b ), and may be a necessary technology if photon counting CT is to overcome detector saturation and charge trapping problems (McCollough et al 2012, Shikhaliev 2009). …”

Section: Introduction: a Short History Of Ffm In Ct Imagingmentioning

confidence: 99%

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Experimental realization of fluence field modulated CT using digital beam attenuation

Szczykutowicz¹,

Mistretta²

2014

Phys. Med. Biol.

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Purpose Tailoring CT scan acquisition parameters to individual patients is a topic of much research in the CT imaging community. It is now common place to find automatically adjusted tube current options for modern CT scanners. In addition, the use of beam shaping filters, commonly called bowtie filters, is available on most CT systems and allows for different body regions to receive different incident x-ray fluence distributions. However, no method currently exists which allows for the form of the incident x-ray fluence distribution to change as a function of view angle. This study represents the first experimental realization of fluence field modulated CT (FFMCT) for a c-arm geometry CT scan. Methods: X-ray fluence modulation is accomplished using a digital beam attenuator (DBA). The device is composed of 10 iron wedge pairs that modulate the thickness of iron x-rays must traverse before reaching a patient. Using this device, experimental data was taken using a Siemens Zeego c-arm scanner. Scans were performed on a cylindrical polyethylene phantom and on two different sections of an anthropomorphic phantom. The DBA was used to equalize the x-ray fluence striking the detector for each scan. Non DBA, or “flat field” scans were also acquired of the same phantom objects for comparison. In addition, a scan was performed in which the DBA was used to enable volume of interest (VOI) imaging. In VOI, only a small sub-volume within a patient receives full dose and the rest of the patient receives a much lower dose. Data corrections unique to using a piece-wise constant modulator were also developed. Results The feasibility of FFMCT implemented using a DBA device has been demonstrated. Initial results suggest dose reductions of up to 3.6 times relative to “flat field” CT. In addition to dose reduction, the DBA enables a large improvement in image noise uniformity and the ability to provide regionally enhanced signal to noise using VOI imaging techniques. Conclusions The results presented in this paper take the field of FFMCT from the theoretical stage to that of possible clinical implementation. FFMCT, as shown in this paper, can reduce patient dose while maintaining or improving image quality. In addition, the DBA has been experimentally shown to be well suited to implement entirely new imaging methods like photon counting and VOI imaging.

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Section: Introduction: a Short History Of Ffm In Ct Imagingmentioning

confidence: 99%

Section: Introduction: a Short History Of Ffm In Ct Imagingmentioning

confidence: 99%

Experimental realization of fluence field modulated CT using digital beam attenuation

Szczykutowicz¹,

Mistretta²

2014

Phys. Med. Biol.

View full text Add to dashboard Cite

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“…This concept enables a new level of patient specific dose modulation that, to our knowledge, is not possible using any other imaging system for conventional and c-arm based CT. While some results have been presented using inverse geometry CT in which fluence modulation (FM) within the fan beam is possible, 8,9 this geometry marks a radical shift from the current geometry used in conventional and c-arm CT imaging today. These inverse geometry techniques have been referred to as "virtual bowties" and essentially provide a similar modulation of x-ray fluence over the fan angle.…”

Section: Introductionmentioning

confidence: 99%

Design of a digital beam attenuation system for computed tomography. Part II. Performance study and initial results

Szczykutowicz

Mistretta

2013

Med. Phys.

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Based on the results presented in this paper and the companion paper [T. Szczykutowicz and C. Mistretta, "Design of a digital beam attenuation system for computed tomography. Part I. System design and simulation framework," Med. Phys. 40, 021905 (2013)], FFMCT implemented via the DBA device seems feasible and should result in both a dose reduction and an improvement in image quality as judged by noise uniformity and scatter reduction. In addition, the dynamic range reduction achievable using the DBA may allow photon counting imaging to become a clinical reality. This study may allow for yet another step to be taken in the field of patient specific dose modulation.

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“…This can be achieved by either the use of shaped filters or temporal modulation of average beam intensity. 4,[7][8][9][10][11][12][13][14][15] Once this is done, a match of the overall brightness and contrast between the CROI and the remainder of the IA is performed to provide an image with a relatively standard appearance.…”

Section: Introductionmentioning

confidence: 99%

Significant radiation reduction in interventional fluoroscopy using a novel eye controlled movable region of interest

Balter

Simon²,

Itkin

et al. 2016

Medical Physics

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The first in vivo evaluation of ECR demonstrated that this technology has objectively reduced KAP and operator irradiation by approximately 75% without interfering with the performance of fluoroscopically guided interventional procedures. In addition, reduced scatter production subjectively improved device visualization. These findings indicate the practicability of achieving better radiation optimization.

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X-ray dose reduction by adaptive source equalization and electronic region-of-interest control

Cited by 6 publications

References 0 publications

Experimental realization of fluence field modulated CT using digital beam attenuation

Experimental realization of fluence field modulated CT using digital beam attenuation

Design of a digital beam attenuation system for computed tomography. Part II. Performance study and initial results

Significant radiation reduction in interventional fluoroscopy using a novel eye controlled movable region of interest

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