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When does a Medical Physicist need to become involved in Evaluations of Equipment Adjustments, Changes, or Repairs?

 

  • Newly Installed X-Ray unit (even if it is used equipment)

  • Newly Installed processor (even if it is used equipment)

  • X-ray unit or processor disassembled and reassembled at the same or new location

  • X-ray tube replacement

  • Collimator replacement

  • Filter replacement

  • AEC replacement

  • New Cassettes

Important Definitions:

MP Oversite= verification may be accomplished by a qualified individual other than the medical physicist. The medical physicist should be consulted as to whether an on-site visit is required or if other personnel can verify the standards are being met, with direction from the medical physicist via telephone or printed material from the physicist.

Qualified Individual = ie: radiolgic technologist or service representative with appropriate training/experience.

Table: Medical Physicist Involvement in Equipment Adjustments, Changes, or Repairs

For any adjustment, change, or repair not listed in the table below, or if the facility is unsure as to the full extent of the adjustment, change, or repair, the facility should consult their medical physicist to determine the proper extent of his or her involvement in evaluating the item.

Adjustments, Changes, or Repairs

Major Adjustment?

Medical Physicist Involvement

AEC    
AEC Replacement  Y MP conducts evaluation in person
Thickness compensation internal adjustment  N MP Oversite
AEC Sensor Replacement  Y MP conducts evaluation in person
AEC Circuit board replacement  Y MP conducts evaluation in person
Density control-internal* adjustment   N MP Oversite
Bucky (new to facility) Replacement    
AEC sensor also replaced  Y MP conducts evaluation in person
AEC sensor not replaced  N MP Oversite

FFDM detector also replaced

Y MP conducts evaluation in person
FFDM detector not replaced

N

MP oversight
Cassette Replacement    
Same screen speed  N MP involvement optional

Faster screen speed 

N MP oversight
Slower screen speed where the dose increase may exceed 3.0 mGy for the standard breast Y MP conducts evaluation in person
Collimator    
Replacement  Y MP conducts evaluation in person
Reassembly with blade replacement   Y MP conducts evaluation in person
Adjustment  N MP Oversite
Compression Device    
Pressure adjustment  N MP involvement optional
Thickness scale accuracy adjustment but only if it affects AEC performance N MP Oversite
Repair of auto decompression  N MP involvement optional
Compression Paddle    
Paddle (new to facility) replacement   N MP Oversite
Deflection adjustment  N MP Oversite
Adjustment due to extension beyond allowable limit, or visibility on images N MP Oversite
Darkroom    
Repair of light leaks  N MP involvement optional
Safe light change  N MP involvement optional
Film type/speed change change N MP Oversite
Processor    
Chemistry type change  N MP involvement optional
Fixer/Developer replacement  N MP involvement optional
Installation  Y MP conducts evaluation in person
Reassembly  Y MP conducts evaluation in person
Replenishment rate adjustment  N MP involvement optional
Roller replacement  N MP involvement optional
X-ray Unit    

kVp, mA or time internal* adjustments

N MP oversight

High voltage generator replacement

Y  MP conducts evaluation in person

X-ray tube replacement

 Y  MP conducts evaluation in person

Filter replacement

Y

 MP conducts evaluation in person

Installation

Y

 MP conducts evaluation in person

Reassembly

Y  MP conducts evaluation in person

Manufacturer's software modifications (see approved alternative standard)

Y  MP conducts evaluation in person

FFDM detector replacement or repair

Y  MP conducts evaluation in person
FFDM Display (monitor)/Printer Replacement Check FFDM manufacturer’s QC manual  Follow FFDM manufacturmanualer’s QC
* Internal adjustments refer to equipment adjustments that typically cannot be made by the operator.

 

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