dcmcrle: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/dcmcrle - from package: dcmtk

You may install the required package with command apt-get install {package}

Error in other languages:
dcmcrle: bevel nie gevind nie
dcmcrle: comandă negăsită
dcmcrle: comando não encontrado
dcmcrle: commande introuvable
dcmcrle: command not found
dcmcrle: käsku ei ole
dcmcrle: không tìm thấy lệnh
dcmcrle: komanda nerasta
dcmcrle: Kommando nicht gefunden.
dcmcrle: kommandot finns inte
dcmcrle: komut yok
dcmcrle: nie znaleziono polecenia
dcmcrle: níor aimsíodh an t-ordú
dcmcrle: no se encontró la orden
dcmcrle: no s'ha trobat l'ordre
dcmcrle: opdracht niet gevonden
dcmcrle: parancs nem található
dcmcrle: perintah tidak ditemukan
dcmcrle: príkaz nenájdený
dcmcrle: příkaz nenalezen
dcmcrle: команда не найдена
dcmcrle: командата не е открита
dcmcrle: 命令找不到
dcmcrle: コマンドが見つかりません