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GOODWILL AND OTHER INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS
 
Goodwill is recorded as a result of business combinations. The following is a reconciliation of Goodwill by business segment for the years ended December 31, 2022 and December 31, 2023 is provided below (in thousands):

Imaging CenterArtificial IntelligenceTotal
Balance as of December 31, 2021$489,210 $24,610 $513,820 
Additions120,551 48,697 169,248 
Disposals(4,200)— (4,200)
Measurement period and other adjustments(106)147 41 
Currency translation1,028 (2,272)(1,244)
Balance as of December 31, 2022$606,483 $71,182 $677,665 
Additions6,473 — 6,473 
Disposals(9,235)— (9,235)
Measurement period and other adjustments1,603 — 1,603 
Currency translation1,233 1,724 2,957 
Balance as of December 31, 2023$606,557 $72,906 $679,463 
 
The amount of goodwill from these acquisitions that is deductible for tax purposes as of December 31, 2023 is $142.7 million.
 
Other intangible assets are primarily related to our business combinations and software development. They include the estimated fair values of such items as service agreements, customer lists, covenants not to compete, acquired technologies, and trade names.
 
Total amortization expense was $12.2 million, $10.1 million, and $4.4 million for the years ended December 31, 2023, 2022 and 2021, respectively. Intangible assets are amortized using the straight-line method over their useful life determined at acquisition. Management service agreements are amortized over 25 years using the straight line method. Software development is capitalized and amortized over the useful life of the software when placed into service. Trade names are reviewed annually for impairment.

The following tables shows annual amortization expense, by asset classes that will be recorded over the next five years (in thousands): 
20242025202620272028ThereafterTotalWeighted average amortization period remaining in years
Management Service Contracts$2,287 $2,287 $2,287 $2,287 $2,287 $6,671 $18,106 7.9
Covenant not to compete and other contracts946 714 427 132 45 6 2,270 3.4
Customer Relationships1,234 1,104 981 797 764 10,564 15,444 17.7
Patent and Trademarks316 316 316 315 300 164 1,727 5.8
Developed Technology & Software7,785 7,785 7,745 7,210 7,046 6,117 43,688 5.7
Trade Names amortized77 77 77 77 63 27 398 5.3
Trade Names indefinite life— — — — — 7,100 7,100 — 
IPR&D— — — — — 1,882 1,882 — 
Total Annual Amortization$12,645 $12,283 $11,833 $10,818 $10,505 $32,531 $90,615