Estimating Patient Organ Dose with Computed Tomography: A Review of Present Methodology and Required DICOM Information&lt;br/&gt; &lt;br/&gt; A Joint Report of AAPM Task Group 246 and the European Federation of Organizations for Medical Physics (EFOMP)

“…The correlation between organ doses and dosimetric DICOM-reported information was recently addressed by AAPM and EFOMP [11]. In the case of CT examinations, SSDE has shown a significant correlation with organ doses [12], but still requires improvement in both its interpretation as a patient radiation protection predictor and its suitability as a risk-associated estimator in clinical situations where organs are partially irradiated.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of CT examinations, SSDE has shown a significant correlation with organ doses [12], but still requires improvement in both its interpretation as a patient radiation protection predictor and its suitability as a risk-associated estimator in clinical situations where organs are partially irradiated. Although these limitations add uncertainties to the organ dose estimations from SSDE, the combination of accurate clinically relevant information into Monte Carlo methods associated with validated SSDE calculations represents a valuable effort in the direction of associate DICOM header and Radiation Dose Structured Report (RDSR) available information with organ doses and patient-risk models [11]. The current improvements of this correlation between SSDE and patient-risk models associated with the method proposed in the present work allow to quantify the dose reduction expected to a given patient cohort when an optimized protocol will be introduced.…”

Section: Introductionmentioning

confidence: 99%

Diagnostic reference level quantities for adult chest and abdomen-pelvis CT examinations: correlation with organ doses

et al. 2023

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Objectives To evaluate correlations between DRL quantities (DRLq) stratified into patient size groups for non-contrast chest and abdomen-pelvis CT examinations in adult patients and the corresponding organ doses. Methods This study presents correlations between DRLq (CTDIvol, DLP and SSDE) stratified into patient size ranges and corresponding organ doses shared in four groups: inside, peripheral, distributed and outside. The demographic, technical and dosimetric parameters were used to identify the influence of these quantities in organ doses. A robust statistical method was implemented in order to establish these correlations and its statistical significance. Results Median values of the grouped organ doses are presented according to the effective diameter ranges. Organ doses in the regions inside the imaged area are higher than the organ doses in peripheral, distributed and outside regions, excepted to the peripheral doses associated with chest examinations. Different levels of statistical significance between organ doses and the DRLq were presented. Conclusions Correlations between DRLq and target-organ doses associated with clinical practice can support guidance’s to the establishment of optimization criteria. SSDE demonstrated to be significant in the evaluation of organ doses is also highlighted. The proposed model allows the design of optimization actions with specific risk-reduction results.

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“…A comprehensive review of the methodology of estimating patient organ dose with CT scans can be found in the AAPM Report 246. 8 A direct method for measuring CT organ dose is thermoluminescent dosimeters (TLDs) inside a patient‐equivalent phantom. TLDs are ideal due to their physical and dosimetric characteristics, including small size, high sensitivity, dose and energy linearity, and reusability.…”

Section: Introductionmentioning

confidence: 99%

“…Absorbed dose in an organ and tissue from CT exposure is not readily available from the CT scanner and is complex to directly measure. A comprehensive review of the methodology of estimating patient organ dose with CT scans can be found in the AAPM Report 246 8 . A direct method for measuring CT organ dose is thermoluminescent dosimeters (TLDs) inside a patient‐equivalent phantom.…”

Section: Introductionmentioning

confidence: 99%

Comparison of organ and effective dose estimations from different Monte Carlo simulation‐based software methods in infant CT and comparison with direct phantom measurements

Lawson

Berk

Badawy

et al. 2022

J Applied Clin Med Phys

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Computational dosimetry software is routinely used to evaluate the organ and effective doses from computed tomography (CT) examinations. Studies have shown a significant variation in dose estimates between software in adult cohorts, and few studies have evaluated software for pediatric dose estimates. This study aims to compare the primary organ and effective doses estimated by four commercially available CT dosimetry software to thermoluminescent dosimeter (TLD) measurements in a 1-year-old phantom. Methods: One hundred fifteen calibrated LiF (Mg, Cu, P)-TLD 100-H chips were embedded within an anthropomorphic phantom representing a 1-year-old child at positions that matched the approximate location of organs within an infant. The phantom was scanned under three protocols, each with whole-body coverage. The mean absorbed doses from 25 radiosensitive organs and skeletal tissues were determined from the TLD readings. Effective doses for each of the protocols were subsequently calculated using ICRP 103 formalism. Dose estimates by the four Monte Carlo-based dose calculation systems were determined and compared to the directly measured doses. Results: Most organ doses determined by computation dosimetry software aligned to phantom measurements within 20%. Additionally, comparisons between effective doses are calculated using computational and direct measurement methods aligned within 20% across the three protocols. Significant variances were found in bone surface dose estimations among dosimetry methods, likely caused by differences in bone tissue modeling. Conclusion: All four-dosimetry software evaluated in this study provide adequate primary organ and effective dose estimations. Users should be aware, however, of the possible estimated uncertainty associated with each of the programs.

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Estimating Patient Organ Dose with Computed Tomography: A Review of Present Methodology and Required DICOM Information<br/> <br/> A Joint Report of AAPM Task Group 246 and the European Federation of Organizations for Medical Physics (EFOMP)

Cited by 15 publications

References 2 publications

The synthetic localizer radiograph – A new CT scan planning method

The synthetic localizer radiograph – A new CT scan planning method

Diagnostic reference level quantities for adult chest and abdomen-pelvis CT examinations: correlation with organ doses

Comparison of organ and effective dose estimations from different Monte Carlo simulation‐based software methods in infant CT and comparison with direct phantom measurements

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