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Ultrasound Quality Analysis & Quality Control – Niranjan Ultrasound India

In several technology application areas, various quality control procedures are utilized. Such procedures evaluate the general quality of the equipment used in many clinical procedures, for both diagnoses and treatments. Many diagnostic instruments in radiology and radiotherapy are routinely analyzed and tested by several quality control procedures, and maintenance reports are provided to ensure the quality of the instruments

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Ultrasound Quality Analysis & Quality Control – Niranjan Ultrasound India

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  1. Ultrasound Quality Analysis & Quality Control – Niranjan Ultrasound India (http://www.ultrasoundindia.com/Ultrasound+Quality+Control+-+Niranjan+Ultrasound+India)Preface(MostCommonlyAskedQuestions) Inseveraltechnologyapplicationareas,variousqualitycontrolproceduresareutilized.Suchprocedures evaluatethegeneralqualityoftheequipmentusedinmanyclinicalprocedures,forbothdiagnosesand treatments. Many diagnostic instruments in radiology and radiotherapy are routinely analyzed and tested by several quality control procedures, and maintenance reports are provided to ensure the quality oftheinstruments. This guideline has the objective to help health and technical professionals to do the basics quality controlproceduresindiagnosticultrasoundequipment.Here,areavailablethemaintestssuchasaxial and lateral resolution, dead zone, focal zone, maximum depth, vertical and horizontal distances and others. Whydoweneedqualitycontrol? Basically, these questions could be answered by two main reasons: The extensive ultrasound equipmentusecreatesaprogressivedegradation,whereitinterferesintheimagequalityandforthe furtherdiagnosticprocedure.Whenyoususpectamalfunctioningoftheequipmentthatappearsinan equipmentpieceQualitycontrolscheduleisrequired.Theschedulecouldbesplitintotwoapproaches: quicktestsandamoredeepevaluation.Forthequicktest,itcouldbeappliedineverytreemonthsfor

  2. portableultrasoundequipment,emergency facilities roomsandgeneraldiagnosticpurposesultrasound equipment. A more deep evaluation could be applied in every six months for all those ultrasound equipment cited before. Baselinereferencemeasurements Thebaselinemeasuresrepresentthemaximumperformancethattheultrasoundequipmenttomake an e覤ort for a specic quality test. Subtle changes are compared with the baselines values for thresholdsofsafetyinordertohavealevelcomparisonwithagroundtruth.Thismeasurementplays anessentialroletoallthequalitycontrolproceduresbecauseitsguaranteeanormalbehaviorthatthe ultrasoundequipmentmustt in. The baseline should be determined preferably immediately after the installation of the ultrasound equipmentorassoonaspossible.Ifthetestingvalues,foraspecicqualitycontrolprocedure,areless thanorabovethanthebaselinevalue,thesystemmustberepaired. The control settings related with the dynamic range, gray level map, the body slice, power, gain, the targetgaincontrol(TGC)shouldbeadjustedusingaphantomthatsimulatestheliverparenchyma.A phantomorsimulatedobjectisthebasicequipmentthatmustbeusedtoperformthequalitycontrol tests.Theseequipmentadjustmentsarenecessarytoadequatetheresultantimageastheusualclinical environment, i.e the usual clinical ultrasound image appearance in contrast and brightness. Once you’ve donethesettings,thenalsetupshouldbestoredinadatasheetandshouldbeusedeverytimethat the quality control tests areperformed in the future. In ordertodeterminethebaselinesvaluestoeach quality controlprocedure: Examinethephantomusingthecontrolsettingslistedinthedatasheet.Setthedepthandthefocal zoneasnecessaryandstoresthesesettingsintothedatasheet for future testing procedures. Performthetestsexactlyasdescribedinthequalitycontrolguidelinesectionandstorethesevalues in thedatasheet.Thesevaluesarethebaselinevalues. Thelevelofaction,orsimplytheactualinterferenceintheultrasoundmaintenance,isindicatedbythe comparativevaluewiththebaselinemeasurementandithasathresholdforthecorrectiveactionthat shouldbetaken.Thebasethresholdadoptedis75%ofthebaselinemeasurement.SeeFigure1.For example,ifthemaximumacceptableerrorofameasureis\pm2%,theacceptablevalueis0.75x2%= \pm1.5%.

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