Frequently Asked Questions

This section provide information on frequently asked questions. We have been concerned about how to classify the examinations according to the RP154 methodology. If you would like to see other questions discussed, please use the contact form on this web site.

FAQ 1: How to identify the TOP 20 chest examinations?

The Excel template for Xray data is prepared according to the categorisation of exams in RP154, as introduced in Chapter 3.1. If you choose the “TOP 20” methodology you need to identify the list of specific radiological codes or examination procedures in your country that are to be included in the TOP20 list. Check carefully the list of indications provided in Appendix 1 to RP154, and be sure you include all practice.

In Chapter 3.1 Table 2, you will find all the specific examination types for the region of chest/thorax (column 2) and those specified for the 74 “DOSE DATAMED” exam categories listed (column 3). The Excel sheet prepared for DDM2 is based on this table (see sheet named “225 Radiography”).

FAQ 1a

In Appendix 1 to RP154 you will find the detailed Examination Descriptions for the ‘Top 20 Exams’. If you compare the two table contents, it appears that TOP 20 number 1. Chest/lung corresponds to two different “74 categories”; Ribs + Chest/thorax/lung.

 FAQ 2b

FAQ 2: What is the relation between “TOP 20 Nr. 7 Pelvis&Hip” and the “72 category” approach

Look into RP154 Chapter 3.1 How to categorise x-ray examinations, Table 2: Plain film radiography:

 FAQ 2A

According to the “74 category” methodology, three categories are dedicated the pelvis region: 12) Pelvic bone, 13) Hips and 14) Pelvis (soft tissue)). Then look into RP154 Appendix 1 Detailed Examination Descriptions for ‘Top 20 Exams’ Table A1.1 PLAIN FILM RADIOGRAPHY (without contrast media)

 FAQ 2b

The indications listed for “TOP 20 Nr. 7 Pelvis&Hip” are quite general (trauma, rheumatology, dysplasia), i.e. this is really not that straight forward, but we would interpret ALL THREE CATEGORIES ARE PART OF THE TOP20 NR 7.

This makes it very difficult to dedicate a dose value to such as the “TOP20 Nr. 7 Pelvis&Hips”.

According to the “74 category” methodology, three categories are dedicated the pelvis region: 12) Pelvic bone, 13) Hips and 14) Pelvis (soft tissue)). Then look into RP154 Appendix 1 Detailed Examination Descriptions for ‘Top 20 Exams’ Table A1.1 PLAIN FILM RADIOGRAPHY (without contrast media)

The indications listed for “TOP 20 Nr. 7 Pelvis&Hip” are quite general (trauma, rheumatology, dysplasia), i.e. this is really not that straight forward, but we would interpret ALL THREE CATEGORIES ARE PART OF THE TOP20 NR 7.

This makes it very difficult to dedicate a dose value to such as the “TOP20 Nr. 7 Pelvis&Hips”.

FAQ 3: What is the relation between “TOP 20 Nr. 8 Ba meal, Nr. 9 Ba enema and Nr. 10 Ba follow” and the “74 category” approach

Look into RP154 Chapter 3.1 How to categorise x-ray examinations, Table 3: Radiography/fluoroscopy (excluding interventional procedures).

 FAQ 3a

According to the “74 category” methodology, three categories are dedicated the gastrointestinal tract: 28) Oesophagus&stomack&small intestine, 29) Colon, and 30) Defecography.

Then look into RP154 Appendix 1 Detailed Examination Descriptions for ‘Top 20 Exams’ Table A1.2 RADIOGRAPHY/FLUOROSCOPY (mostly involving use of contrast media)

FAQ 3b

The indications listed for “TOP 20” Nr. 8 Ba meal and and 10 Ba follow” ARE BOTH INCLUDED IN “74 category” Nr. 28) Oesophagus&stomack&small intestine, while “TOP 20” Nr. 9 corresponds to “74 category” Nr. 29), i.e. in this case you have more detailed information using the “TOP 20” approach.

FAQ 4: What is the relation between “TOP 20 Nr. 12 Cardiac angiography” and the “74 category” approach?

Look into RP154 Chapter 3.1 How to categorise x-ray examinations, Table 3: Radiography/fluoroscopy (excluding interventional procedures). According to the “74 category” methodology only one category is dealing with cardiac angiography. Table 5: Interventional Radiology has different cardiac procedures defined, but these are not interpreted as Cardiac angiography.

 FAQ 4a

Then look into RP154 Appendix 1 Detailed Examination Descriptions for ‘Top 20 Exams’ Table A1.2 RADIOGRAPHY/FLUOROSCOPY (mostly involving use of contrast media). It apprears that “TOP 20” Nr. 12) corresponds directly to “74 category” Nr. 39).

 FAQ 4b

FAQ 5: What is the relation between “TOP 20 Nr. 13 CT head” and the “74 category” approach?

Look into RP154 Chapter 3.1 How to categorise x-ray examinations, Table 4 CT Examinations. According to the “74 category” methodology, three CT categories are dedicated the region of the head: 45) Skull & facial bones, 46) Brain, and 47) Head soft tissues.

 FAQ 5a

Then look into RP154 Appendix 1 Detailed Examination Descriptions for ‘Top 20 Exams’ Table A1.3 COMPUTED TOMOGRAPHY. From the list of indications it actually seems like all three categories 45 – 47 are included in the “TOP 20” CT head.  FAQ 5b

FAQ 6: What is the relation between “TOP 20 Nr. 14 CT Neck” and the “74 category” approach?

Look into RP154 Chapter 3.1 How to categorise x-ray examinations, Table 4 CT Examinations. According to the “74 category” methodology, two CT categories are dedicated the region of the neck: 48) Cervical spine and 49) Neck

 FAQ 6a

Then look into RP154 Appendix 1 Detailed Examination Descriptions for ‘Top 20 Exams’ Table A1.3 COMPUTED TOMOGRAPHY. From the list of indications you may interpret both category 48) Cervical spine and 49) Neck as part of “TOP 20” Nr. 14 CT neck. Obviously this may have been interpreted differently, since it is specified “No contrast” which may mean only Cervical Spine to be counted.

 FAQ 6b

FAQ 7: What is the relation between “TOP 20” in the chest/abdomen/pelvis region and the “74 category” approach?

This question really has to be discussed, since various interpretations are possible. From the Excel sheet on the www.ddmed.eu

 FAQ 7a

Look into RP154 Chapter 3.1 How to categorise x-ray examinations, Table 4 CT Examinations. According to the “74 category” methodology, many CT categories are dedicated the region of the chest/abdomen/pelvis. The spine is involved in the whole region, and you have options involving one or more regions.

 FAQ 7b

Then look into RP154 Appendix 1 Detailed Examination Descriptions for ‘Top 20 Exams’ Table A1.3 COMPUTED TOMOGRAPHY.

 FAQ 7c

From the list of indications some choices are clear while others more object to interpretations:

  • 74 category Nr 50 Thoracic spine is not a “TOP 20” exam
  • 74 category Nr 51 Chest/Thorax corresponds to “TOP 20” Nr. 15 CT chest
  • 74 category Nr 52 Lumbar spine corresponds to “TOP 20” Nr. 16 CT of lumbar spine
  • “TOP 20” examination Nr. 18) CT pelvis includes NB NB both 74 category Nr. 55 Pelvic bones, Nr. 56) Pelvimetry and Nr. 57) Pelvis
  • “TOP 20” examination Nr. 17 CT abdomen should include both 74 category Nr) 53 abdomen and Nr 54) Liver, pancreas, kidneys
  • 74 category Nr 62 corresponds directly to TOP 20 examination 19) CT trunk
  • 74 category Nr 58 – 61 opens for registration of CT examinations of several regions (I
faq.txt · Last modified: 2011/09/28 12:04 by Andreas Jahnen
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