A tissue‐equivalent phantom series for mammography dosimetry

Argo, William P.; Hintenlang, Kathleen M.; Hintenlang, David E.

doi:10.1120/jacmp.v5i4.1956

Cited by 12 publications

(9 citation statements)

References 8 publications

(18 reference statements)

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“…12 Figure 8 illustrates the radiological image of an FOC dosimeter relative to a 4 cm thick 50% glandularity breast phantom. 13,14 The image demonstrates that while the dosimeter is unobtrusive on the image, it could potentially obscure important diagnostic information on a mammogram. Caution should, therefore, be exercised prior to placing the dosimeter on a patient for true in vivo measurements.…”

Section: Dosimeter Linearitymentioning

confidence: 99%

Characterization of a fiber‐optic‐coupled radioluminescent detector for application in the mammography energy range

Benevides¹,

Huston

Justus

et al. 2007

Medical Physics

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Fiber-optic-coupled radioluminescent (FOC) dosimeters are members of a new family of dosimeters that are finding increased clinical applications. This study provides the first characterization of a Cu doped quartz FOC dosimeter at diagnostic energies, specifically across the range of x-ray energies and intensities used in mammographies. We characterize the calibration factors, linearity, angular dependence, and reproducibility of the FOC dosimeters. The sensitive element of each dosimeter was coupled to a photon counting photomultiplier module via 1 m long optical fibers. A computer controlled interface permitted real-time monitoring of the dosimeter output and rapid data acquisition. The axial-angular responses for all dosimeter models show nearly uniform response without any marked decrease in sensitivity. However, the normal-to-axial angular response showed a marked decrease in sensitivity of about 0 degrees C and 180 degrees C. In most clinical applications, appropriate dosimeter positioning can minimize the contributions of the varying normal-to-axial response. The FOC dosimeters having the greatest sensitive length provided the greatest sensitivity, with greatest to lowest sensitivity observed for 4.0, 1.9, 1.6, and 1.1 mm length sensitive elements. The average sensitivity of the dosimeters varies linearly with sensitive volume (R2=95%) and as a function of tube potential and target/filter combinations, generally exhibiting an increased sensitivity for higher energies. The dosimeter sensitivity as a function of tube potential had an average increase of 4.72 +/- 2.04% for dosimeter models and three target-filter combinations tested (Mo/Mo, Mo/Rh, and Rh/Rh) over a range of 25-31 kVp. All dosimeter models exhibited a linear response (R2 > or = 0.997) to exposure for all target-filter combinations, tube potentials, and tube current-time product stations evaluated and demonstrated reproducibility within 2%. All of the dosimeters examined in this study provided a response adequate for the accurate measurement of doses in clinical mammography applications.

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Section: Dosimeter Linearitymentioning

confidence: 99%

Characterization of a fiber‐optic‐coupled radioluminescent detector for application in the mammography energy range

Benevides¹,

Huston

Justus

et al. 2007

Medical Physics

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“…The ACR mammography phantom is 4.2 cm thick and consists of 3.5 cm Lucite and a 0.7 cm thick paraffin insert, which contains the image quality indicators (2) . The NORMI PAS phantom (PTW‐Freiburg GmbH, Freiburg, Germany) is used for image quality assurance on digital mammography units.…”

Section: Introductionmentioning

confidence: 99%

Development of a universal medical X‐ray imaging phantom prototype

Groenewald¹,

Groenewald

2016

J Applied Clin Med Phys

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Diagnostic X‐ray imaging depends on the maintenance of image quality that allows for proper diagnosis of medical conditions. Maintenance of image quality requires quality assurance programs on the various X‐ray modalities, which consist of projection radiography (including mobile X‐ray units), fluoroscopy, mammography, and computed tomography (CT) scanning. Currently a variety of modality‐specific phantoms are used to perform quality assurance (QA) tests. These phantoms are not only expensive, but suitably trained personnel are needed to successfully use them and interpret the results. The question arose as to whether a single universal phantom could be designed and applied to all of the X‐ray imaging modalities. A universal phantom would reduce initial procurement cost, possibly reduce the time spent on QA procedures and simplify training of staff on the single device. The aim of the study was to design and manufacture a prototype of a universal phantom, suitable for image quality assurance in general X‐rays, fluoroscopy, mammography, and CT scanning. The universal phantom should be easy to use and would enable automatic data analysis, pass/fail reporting, and corrective action recommendation. In addition, a universal phantom would especially be of value in low‐income countries where finances and human resources are limited. The design process included a thorough investigation of commercially available phantoms. Image quality parameters necessary for image quality assurance in the different X‐ray imaging modalities were determined. Based on information obtained from the above‐mentioned investigations, a prototype of a universal phantom was developed, keeping ease of use and reduced cost in mind. A variety of possible phantom housing and insert materials were investigated, considering physical properties, machinability, and cost. A three‐dimensional computer model of the first phantom prototype was used to manufacture the prototype housing and inserts. Some of the inserts were 3D‐printed, others were machined from different materials. The different components were assembled to form the first prototype of the universal X‐ray imaging phantom. The resulting prototype of the universal phantom conformed to the aims of a single phantom for multiple imaging modalities, which would be easy to use and manufacture at a reduced cost. A PCT International Patent Application No. PCT/IB2016/051165 has been filed for this technology.PACS number(s): 87.57.C, 87.59.‐e

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“…Tissue-equivalent materials are necessary for a vast number of purposes regarding radiation interaction (Argo et al 2004;Boone et al 2000). Equipment calibrations, quality control, the design of therapeutic or diagnostic rooms, are some of the tasks that require these materials.…”

Section: List Of Tablesmentioning

confidence: 99%

“…Another complication factor is the diverse composition of breast tissue among women, since the adipose to glandular tissue proportion (breast glandularity) and the breast density vary greatly (Ng and Lau 2015). This culminates in the necessity of different bTEM materials for each glandularity (Argo et al 2004).…”

Section: A Brief History Of Mammography and The State Of The Art In Bmentioning

confidence: 99%

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Desenvolvimento de método de análise de materiais equivalentes ao tecido humano por simulação Monte Carlo

Fernandes¹

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A tissue‐equivalent phantom series for mammography dosimetry

Cited by 12 publications

References 8 publications

Characterization of a fiber‐optic‐coupled radioluminescent detector for application in the mammography energy range

Characterization of a fiber‐optic‐coupled radioluminescent detector for application in the mammography energy range

Development of a universal medical X‐ray imaging phantom prototype

Desenvolvimento de método de análise de materiais equivalentes ao tecido humano por simulação Monte Carlo

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