2018
Monte Carlo dosimetry modeling of focused kV x‐ray radiotherapy of eye diseases with potential nanoparticle dose enhancement
Yan H, Ma X, Sun W, Mendez S, Stryker S, Starr‐Baier S, Delliturri G, Zhu D, Nath R, Chen Z, Roberts K, MacDonald CA, Liu W. Monte Carlo dosimetry modeling of focused kV x‐ray radiotherapy of eye diseases with potential nanoparticle dose enhancement. Medical Physics 2018, 45: 4720-4733. PMID: 30133705, DOI: 10.1002/mp.13144.Peer-Reviewed Original ResearchConceptsX-ray beamMC simulation programEye plaque treatmentCentral axis depth doseMC simulationsDose distributionBeam focusingEye Physics plaquesPhantom irradiationDose enhancementEnergy spectrumDepth doseLens modelingDosimetry modelingPhotoelectric absorptionKV rangeKV X-ray beamsBeamEBT3 filmSimulation programEnergy regimeModelingX-ray techniquesHalf maximumMore flexibility
2014
Examining the Cost-Effectiveness of Radiation Therapy Among Older Women With Favorable-Risk Breast Cancer
Sen S, Wang SY, Soulos PR, Frick KD, Long JB, Roberts KB, Yu JB, Evans SB, Chagpar AB, Gross CP. Examining the Cost-Effectiveness of Radiation Therapy Among Older Women With Favorable-Risk Breast Cancer. Journal Of The National Cancer Institute 2014, 106: dju008. PMID: 24598714, PMCID: PMC3982782, DOI: 10.1093/jnci/dju008.Peer-Reviewed Original ResearchMeSH KeywordsAgedAged, 80 and overBrachytherapyBreast NeoplasmsComorbidityCost-Benefit AnalysisFemaleHealth ExpendituresHumansLife ExpectancyMedicareNeoplasm Recurrence, LocalNeoplasm StagingQuality of LifeQuality-Adjusted Life YearsRadiotherapy, Intensity-ModulatedRisk AssessmentRisk FactorsSampling StudiesSEER ProgramUnited StatesConceptsExternal beam radiation therapyIncremental cost-effectiveness ratioQuality-adjusted life yearsBreast cancerOlder womenRadiation therapyEnd Results-Medicare databaseRisk breast cancerBeam radiation therapyCost-effectiveness ratioNewer radiation therapy modalitiesQuality of lifeRadiation therapy modalitiesLocal recurrenceTrial criteriaRT modalityTherapy modalitiesLife yearsCancerIncremental costTherapyWomenBaseline stateNew modality
2013
For-profit hospital ownership status and use of brachytherapy after breast-conserving surgery
Sen S, Soulos PR, Herrin J, Roberts KB, Yu JB, Lesnikoski BA, Ross JS, Krumholz HM, Gross CP. For-profit hospital ownership status and use of brachytherapy after breast-conserving surgery. Surgery 2013, 155: 776-788. PMID: 24787104, PMCID: PMC4008843, DOI: 10.1016/j.surg.2013.12.009.Peer-Reviewed Original ResearchConceptsHospital ownership statusBreast-conserving operationsBreast-conserving surgeryUse of brachytherapyRadiation therapyOperative careBreast cancerMedicare beneficiariesOverall useReceipt of brachytherapyAdjuvant radiation therapyInvasive breast cancerFemale Medicare beneficiariesGreater overall useYears of ageShort life expectancyRetrospective studyRT modalityProfit hospitalsExpensive modalityOlder womenBrachytherapy useBreast brachytherapyHospitalBrachytherapyReply to L.W. Cuttino et al
Presley CJ, Soulos PR, Herrin J, Roberts KB, Yu JB, Gross CP. Reply to L.W. Cuttino et al. Journal Of Clinical Oncology 2013, 31: 2227-2229. PMID: 23901421, DOI: 10.1200/jco.2013.49.0441.Peer-Reviewed Original Research
2012
The Adoption of New Adjuvant Radiation Therapy Modalities Among Medicare Beneficiaries With Breast Cancer: Clinical Correlates and Cost Implications
Roberts KB, Soulos PR, Herrin J, Yu JB, Long JB, Dostaler E, Gross CP. The Adoption of New Adjuvant Radiation Therapy Modalities Among Medicare Beneficiaries With Breast Cancer: Clinical Correlates and Cost Implications. International Journal Of Radiation Oncology • Biology • Physics 2012, 85: 1186-1192. PMID: 23182396, PMCID: PMC3606652, DOI: 10.1016/j.ijrobp.2012.10.009.Peer-Reviewed Original ResearchConceptsExternal beam radiation therapyRadiation therapy modalitiesRadiation therapy costsBreast cancerRadiation therapyTherapy modalitiesTherapy costsBrachytherapy useRadiation oncologistsEnd Results-Medicare databaseConventional external beam radiation therapyAdoption of intensityBreast-conserving surgeryRadiation therapy useUse of IMRTBeam radiation therapyNewer radiation therapy modalitiesHierarchical logistic regressionHospital-based facilitiesTherapy useClinical factorsClinical correlatesTreatment optionsTreatment choicePhysician preferencePatterns of Use and Short-Term Complications of Breast Brachytherapy in the National Medicare Population From 2008–2009
Presley CJ, Soulos PR, Herrin J, Roberts KB, Yu JB, Killelea B, Lesnikoski BA, Long JB, Gross CP. Patterns of Use and Short-Term Complications of Breast Brachytherapy in the National Medicare Population From 2008–2009. Journal Of Clinical Oncology 2012, 30: 4302-4307. PMID: 23091103, PMCID: PMC3675700, DOI: 10.1200/jco.2012.43.5297.Peer-Reviewed Original ResearchConceptsWhole breast irradiationHospital referral regionsBone complicationsClinical characteristicsSkin complicationsEarly-stage breast cancerNational treatment patternsPercent of patientsShort-term complicationsBreast-conserving surgeryNational Medicare populationComplication rateTreatment patternsAge 66Breast cancerReferral regionsMedicare populationPatterns of useComplicationsMedicare beneficiariesTreatment groupsClinical practiceBreast brachytherapyBrachytherapyInstrumental variable analysis
2011
The impact of prostate edema on cell survival and tumor control after permanent interstitial brachytherapy for early stage prostate cancers
Chen Z, Roberts K, Decker R, Pathare P, Rockwell S, Nath R. The impact of prostate edema on cell survival and tumor control after permanent interstitial brachytherapy for early stage prostate cancers. Physics In Medicine And Biology 2011, 56: 4895-4912. PMID: 21772076, PMCID: PMC3154133, DOI: 10.1088/0031-9155/56/15/016.Peer-Reviewed Original ResearchConceptsPermanent interstitial brachytherapyProstate edemaProstate cancerEffects of edemaTumor control probabilityImpact of edemaInterstitial brachytherapyCell survivalEarly-stage prostate cancerControl probabilityStage prostate cancerCurrent clinical practiceProstate cancer cellsTumor cell proliferationInterstitial brachytherapy treatmentSublethal damage repairDose variationTumor cell survivalTumor characteristicsTumor controlClinical impactEdemaEdema evolutionClinical practiceProstate gland
2007
On the Need to Compensate for Edema-Induced Dose Reductions in Preplanned 131Cs Prostate Brachytherapy
Chen ZJ, Deng J, Roberts K, Nath R. On the Need to Compensate for Edema-Induced Dose Reductions in Preplanned 131Cs Prostate Brachytherapy. International Journal Of Radiation Oncology • Biology • Physics 2007, 70: 303-310. PMID: 17980500, PMCID: PMC2289996, DOI: 10.1016/j.ijrobp.2007.09.007.Peer-Reviewed Original ResearchConceptsDose reductionProstate brachytherapyDose compensationLarge edemaBiochemical recurrence-free survivalRecurrence-free survivalSignificant dose reductionEffects of edemaSublethal damage repairAdditional irradiationPrescription doseProstate cancerIndividual patientsEdemaEdema evolutionPrescribed doseProstate edemaEffective doseRadiobiologic effectsBrachytherapyDoseProstate implantsDose responseImplants
2006
Potential impact of prostate edema on the dosimetry of permanent seed implants using the new (model CS‐1) seeds
Chen Z, Deng J, Roberts K, Nath R. Potential impact of prostate edema on the dosimetry of permanent seed implants using the new (model CS‐1) seeds. Medical Physics 2006, 33: 968-975. PMID: 16696473, DOI: 10.1118/1.2179170.Peer-Reviewed Original Research
2004
Relation of clinical success in coronary brachytherapy to dose
Singh HS, Yue N, Azimi N, Nath R, Roberts KB, Pfau S. Relation of clinical success in coronary brachytherapy to dose. The American Journal Of Cardiology 2004, 94: 847-852. PMID: 15464663, DOI: 10.1016/j.amjcard.2004.06.016.Peer-Reviewed Original ResearchMeSH KeywordsAdultAgedAged, 80 and overBrachytherapyCase-Control StudiesConnecticutCoronary AngiographyCoronary RestenosisCoronary VesselsDose-Response Relationship, RadiationFemaleFollow-Up StudiesHumansMaleMiddle AgedMultivariate AnalysisRadiotherapy DosageRetrospective StudiesStatistics as TopicTreatment OutcomeUltrasonography, InterventionalConceptsTreatment failureExternal elastic membraneTreatment successStent restenosisIntravascular ultrasoundAdequate dose deliveryRecurrent restenosisLesion patternsPrimary treatmentCoronary brachytherapyClinical successPatientsDose prescriptionRadiation delivery systemsArteryRestenosisGyDoseBrachytherapyDose thresholdRadiation delivery devicePotential causesDose deliveryIntravascular brachytherapyTreatmentOptimization of dose distributions for bifurcated coronary vessels treated with catheter‐based photon and beta emitters using the simulated annealing algorithm
Yue N, Roberts KB, Son H, Khosravi S, Pfau SE, Nath R. Optimization of dose distributions for bifurcated coronary vessels treated with catheter‐based photon and beta emitters using the simulated annealing algorithm. Medical Physics 2004, 31: 2610-2622. PMID: 15487744, DOI: 10.1118/1.1783533.Peer-Reviewed Original ResearchMeSH KeywordsAlgorithmsAnimalsBeta ParticlesBlood Vessel ProsthesisBrachytherapyCatheterizationCatheters, IndwellingComputer SimulationCoronary RestenosisHumansModels, CardiovascularPhotonsRadiometryRadiotherapy DosageRadiotherapy Planning, Computer-AssistedRelative Biological EffectivenessReproducibility of ResultsSensitivity and SpecificityConceptsTreatment schemeCatheter-based delivery systemBetter dose distributionDose distributionDwell positionsPrescription doseCoronary vesselsBranch vesselsBranch treatmentBifurcation angleSatisfactory dose distributionMultiple dwell positionsVesselsOverdosingDelivery systemGeometry of bifurcationsEffects of vessel curvature on dose distributions in catheter-based intravascular brachytherapy for various radionuclides
Yue N, Roberts K, Nath R. Effects of vessel curvature on dose distributions in catheter-based intravascular brachytherapy for various radionuclides. Cardiovascular Revascularization Medicine 2004, 5: 142-150. PMID: 15721850, DOI: 10.1016/j.carrad.2004.08.002.Peer-Reviewed Original Research
2003
Brachytherapy for in-stent restenosis in general interventional practice A single institution's experience using four radiation devices
Singh HS, Roberts KB, Yue N, Nath R, Song GH, Azimi N, Pfau S. Brachytherapy for in-stent restenosis in general interventional practice A single institution's experience using four radiation devices. Cardiovascular Revascularization Medicine 2003, 4: 126-132. PMID: 14984712, DOI: 10.1016/s1522-1865(03)00183-5.Peer-Reviewed Original ResearchMeSH KeywordsAdultAgedAged, 80 and overAngioplasty, Balloon, CoronaryBlood Vessel Prosthesis ImplantationBrachytherapyConnecticutCoronary AngiographyCoronary Artery BypassCoronary RestenosisCoronary StenosisEquipment DesignFamily PracticeFemaleFollow-Up StudiesHospital MortalityHumansMaleMiddle AgedRadiation DosageReoperationRetrospective StudiesStentsTreatment OutcomeConceptsMajor adverse cardiac eventsStent restenosisAverage treatment ageEffectiveness of brachytherapyAdverse cardiac eventsSingle institution experienceMinimal lumen diameterRandomized clinical trialsLesion-specific characteristicsSpectrum of patientsMACE rateHospital deathCardiac eventsRenal failureUnstable anginaClinical outcomesCoronary lesionsTreatment failureInstitution experienceFrequent presentationInterventional therapyClinical trialsGeneral populationInterventional practicePatientsDose distributions in bifurcated coronary vessels treated with catheter‐based photon and beta emitters in intravascular brachytherapy
Yue N, Roberts KB, Pfau SE, Nath R. Dose distributions in bifurcated coronary vessels treated with catheter‐based photon and beta emitters in intravascular brachytherapy. Medical Physics 2003, 30: 1628-1636. PMID: 12906180, DOI: 10.1118/1.1582813.Peer-Reviewed Original Research
2000
Dosimetric effects of edema in permanent prostate seed implants: a rigorous solution
Chen Z, Yue N, Wang X, Roberts K, Peschel R, Nath R. Dosimetric effects of edema in permanent prostate seed implants: a rigorous solution. International Journal Of Radiation Oncology • Biology • Physics 2000, 47: 1405-1419. PMID: 10889396, DOI: 10.1016/s0360-3016(00)00549-6.Peer-Reviewed Original ResearchDosimetric penumbra effects in catheter-based intravascular brachytherapy using a centered photon or beta line source.
Yue N, Nath R, Roberts K. Dosimetric penumbra effects in catheter-based intravascular brachytherapy using a centered photon or beta line source. Cardiovascular Revascularization Medicine 2000, 2: 32-8. PMID: 11229060.Peer-Reviewed Original ResearchMeSH KeywordsBrachytherapyConstriction, PathologicHumansMonte Carlo MethodRadiation DosageRadiometryVascular DiseasesConceptsLongitudinal dose uniformityCatheter-based intravascular brachytherapyRate kernelLine sourceCylindrical blood vesselPenumbra effectMonte Carlo simulationsBlood vesselsMargin lengthRadiation transportCarlo simulationsPhoton emittersEdge effectsRatio of doseDose distributionIntravascular brachytherapySource lengthRadial depthLength LRadioactive sourcesLinear sourceFormalismPhoton sourcesPoints of interestCorresponding radionuclide
1999
Long‐term complications with prostate implants: Iodine‐125 vs. palladium‐103
Peschel R, Chen Z, Roberts K, Nath R. Long‐term complications with prostate implants: Iodine‐125 vs. palladium‐103. International Journal Of Cancer 1999, 7: 278-288. PMID: 10580897, DOI: 10.1002/(sici)1520-6823(1999)7:5<278::aid-roi3>3.0.co;2-3.Peer-Reviewed Original ResearchMeSH KeywordsActuarial AnalysisBrachytherapyCell DeathFollow-Up StudiesForecastingHumansIodine RadioisotopesLongitudinal StudiesMaleModels, BiologicalNeoplasm StagingPalladiumProbabilityProstatic NeoplasmsRadioisotopesRadiopharmaceuticalsRadiotherapy DosageRelative Biological EffectivenessRetrospective StudiesTreatment OutcomeConceptsLong-term complicationsMinimum tumor dosesComplication ratePd-103Lower overall complication ratePalladium-103Long-term complication rateIodine-125Overall complication rateHigh complication rateProstate cancer patientsProstate implantsActuarial probabilityGrade IIILog10 cell killCancer patientsVs. 6Tumor dosesClinical practiceCell killProstate cancer brachytherapyEffective doseNormal tissuesPatientsTissue beds
1998
Correlation of medical dosimetry quality indicators to the local tumor control in patients with prostate cancer treated with iodine‐125 interstitial implants
Nath R, Roberts K, Ng M, Peschel R, Chen Z. Correlation of medical dosimetry quality indicators to the local tumor control in patients with prostate cancer treated with iodine‐125 interstitial implants. Medical Physics 1998, 25: 2293-2307. PMID: 9874821, DOI: 10.1118/1.598440.Peer-Reviewed Original ResearchConceptsSurvival rateProstate cancerInterstitial implantsLocal recurrence-free survival rateRecurrence-free survival ratesLocal control rateLocal tumor controlExcellent clinical resultsProstate cancer patientsUnfavorable groupClinical efficacyCancer patientsControl rateTumor controlClinical resultsFavorable groupDose coveragePatientsDosimetric parametersDosimetry parametersIsodose surfaceSignificant differencesVirginia studyUnfavorable parametersCancerEffective Treatment of Stage I Uterine Papillary Serous Carcinoma with High Dose-Rate Vaginal Apex Radiation (192Ir) and Chemotherapy
Turner B, Knisely J, Kacinski B, Haffty B, Gumbs A, Roberts K, Frank A, Peschel R, Rutherford T, Edraki B, Kohorn E, Chambers S, Schwartz P, Wilson L. Effective Treatment of Stage I Uterine Papillary Serous Carcinoma with High Dose-Rate Vaginal Apex Radiation (192Ir) and Chemotherapy. International Journal Of Radiation Oncology • Biology • Physics 1998, 40: 77-84. PMID: 9422561, DOI: 10.1016/s0360-3016(97)00581-6.Peer-Reviewed Original ResearchMeSH KeywordsAdultAgedAged, 80 and overAntineoplastic Combined Chemotherapy ProtocolsBrachytherapyChemotherapy, AdjuvantCystadenocarcinoma, PapillaryDisease-Free SurvivalFemaleHumansHysterectomyMiddle AgedNeoplasm Recurrence, LocalNeoplasm StagingRetrospective StudiesSalvage TherapyUterine NeoplasmsConceptsUterine papillary serous carcinomaWhole pelvic radiation therapyWhole-abdomen radiation therapyComplete surgical stagingDisease-free survivalActuarial disease-free survivalFIGO stage IPapillary serous carcinomaSurgical stagingActuarial OSOverall survivalSalvage rateStage IRadiation therapyUPSC patientsVaginal brachytherapyMyometrial invasionSerous carcinomaLDR brachytherapyRadiation Therapy Oncology Group (RTOG) grade 1DFS of patientsPara-aortic lymph node samplingConventional external beam radiotherapyFIGO stage IARTOG grade 3
1997
Treatment of recurrent pelvic and selected primary gynecologic malignancies with 241Am
Chung J, Roberts K, Peschel R, Nath R, Pourang R, Kacinski B, Wilson L. Treatment of recurrent pelvic and selected primary gynecologic malignancies with 241Am. International Journal Of Cancer 1997, 5: 227-234. PMID: 9372545, DOI: 10.1002/(sici)1520-6823(1997)5:5<227::aid-roi3>3.0.co;2-#.Peer-Reviewed Original ResearchConceptsRecurrent pelvic malignanciesPrimary gynecologic malignanciesPrimary radiotherapySurgical salvageMicroscopic diseasePelvic malignanciesPostoperative radiotherapyGynecologic malignanciesUltimate local control rateExternal beam radiation therapyGross primary tumorMedian patient ageLocal control rateTreatment of recurrentBeam radiation therapyMicroscopic residuumTreatment intentPatient ageSurgical resectionCurative therapyGynecologic tumorsGynecologic cancerControl ratePrimary tumorRadiation therapy